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Then to figure out what the denominator here is, if we want the same fraction, we have to multiply by 9/2 again. Now the last thing I'm going to show you involves a little bit of algebra.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.The following proportion is read as "twenty is to twenty-five as four is to five." In problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion.To find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.If the ratio of the red marbles to the blue marbles is the same for both John and Jane, then John has how many more blue marbles than Jane? Example: A recipe uses 5 cups of flour for every 2 cups of sugar. If you're seeing this message, it means we're having trouble loading external resources on our website.We can also use cross products to find a missing term in a proportion. In a horror movie featuring a giant beetle, the beetle appeared to be 50 feet long.However, a model was used for the beetle that was really only 20 inches long.If you're behind a web filter, please make sure that the domains *.and *.are unblocked.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.