# The Definition of Constant Ratios in Mathematics

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Constant ratios talks about the ratio between two variables. Get the definition of constant ratios in mathematics with help from a longtime mathematics educator in this free video clip.

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## Video Transcript

Hi, I'm Jimmy Chang, and we're here to talk about the definition of constant ratios in mathematics. Now, constant ratios in math basically talks about, that the ratio between two variables generally, is constant. Now, where this is used often, is the direct variation scenario, where you have Y is equal to KX, for example. Now, K is a constant, constant of variation. And the reason that you can say in this case, it'll be a constant ratio, is because the ratio between these two variables is constant. So, for example, if you divide both sides by X, the X's cancel, and you're going to have Y over X is equal to that constant K. So, if you want to use a specific number as an illustration. If you have Y is equal to four-X, if you divide both sides by X. You're going to have a situation where Y over X, is equal to four. That means that, if you take the ratio of Y and X. Then, the number that separates the two ratios is going to be four. So, that means that the ratio between these two variables is that constant four. So, basically as long as you have two variables that are divided by each other, and you get a constant. You have literally, a constant ration. So, I'm Jimmy Chang and that's the definition of constant ratio in mathematics.

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