*If you're behind a web filter, please make sure that the domains *.and *.are unblocked. And there's a bunch of different ways to solve this. Or another way to write 10/8, 10/8 is the same thing as 5/4. You could do that without thinking in strict algebraic terms. If I multiply these out, this guy and that guy cancel out, and it's definitely 360. But now we want to actually divide this to actually get our right answer, or a simplified answer. So let's rewrite our proportion, 8/36 is equal to 10/n. Well the easiest way to solve for n is maybe multiply both-- this thing on the left is equal to this thing on the right. These guys cancel out and we're left with n is equal to 10 times 36 is 360/8.*And I'll explore really all of them, or a good selection of them. So we're multiplying by 5/4 to get to 10, from 8 to 10. And so we could say this n, this thing that we just solved for, this n is going to be equal to 36 times 5 divided by 4. 8 goes into 360, 8 goes into 36 4 times, 4 times 8 is 32. And notice, we're getting the exact same value that we got with cross-multiplying.We can divide both sides of the equation by the same number, without changing the meaning of the equation.

*If you're behind a web filter, please make sure that the domains *.and *.are unblocked. And there's a bunch of different ways to solve this. Or another way to write 10/8, 10/8 is the same thing as 5/4. You could do that without thinking in strict algebraic terms. If I multiply these out, this guy and that guy cancel out, and it's definitely 360. But now we want to actually divide this to actually get our right answer, or a simplified answer. So let's rewrite our proportion, 8/36 is equal to 10/n. Well the easiest way to solve for n is maybe multiply both-- this thing on the left is equal to this thing on the right. These guys cancel out and we're left with n is equal to 10 times 36 is 360/8.*And I'll explore really all of them, or a good selection of them. So we're multiplying by 5/4 to get to 10, from 8 to 10. And so we could say this n, this thing that we just solved for, this n is going to be equal to 36 times 5 divided by 4. 8 goes into 360, 8 goes into 36 4 times, 4 times 8 is 32. And notice, we're getting the exact same value that we got with cross-multiplying.We can divide both sides of the equation by the same number, without changing the meaning of the equation.

A 30-inch tall model building was also used in the movie. First, write the proportion, using a letter to stand for the missing term.

We find the cross products by multiplying 20 times x, and 50 times 30. Study this step closely, because this is a technique we will use often in algebra.

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If you're seeing this message, it means we're having trouble loading external resources on our website. Or the ratio of 8/36 is equal to the ratio of 10 to what. Now sometimes when you see proportion like this, sometimes people say, oh you can cross-multiply. And it really comes out of a little bit of algebra. But if you don't understand it, or if it doesn't make as much sense to you at this point, don't worry too much about it. When you cross-multiply, you're saying that the numerator here, times the denominator over here, is going to be equal to, so 8 times n, is going to be equal to the denominator over here, let me just different color, the denominator over here, times the numerator over here. And we're getting n is equal to 360 divided by 8. If I write 8 times question mark is equal to 360, well, question mark could definitely be 360/8. But you could stop watching this, if you'll find this part confusing. If we want just an n here, we would want to multiply this side times 36-- I'll do that in a different color-- we'd want to multiply this side times 36 times 8, because if you multiply these guys out, you get 1. But since we're doing it to the left-hand side, we also have to do it to the right-hand side, so times 36/8.

Well, we're using three times more oatmeal, Right? 3 cups of oatmeal and 9 cups of oatmeal, we're using 3 times the oatmeal.

Well, if we want to use flour in the same proportion, we have to use 3 times the flour.

Probably the most obvious way, or the easiest way to do it in your head, was either just looking at what you have to multiply the numerator by and then doing the same thing to the denominator, or maybe by cross-multiplication.

A recipe for oatmeal cookies calls for 2 cups of flour for every 3 cups of oatmeal.

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## Comments How To Solve Ratio And Proportion Math Problems

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