![]() For example, if the price of a hamburger has risen by 10%, you might express this as a proportion: old price / 100 = new price / 110, so if you know the old price you can solve the proportion equation to find the new price. Proportions are used in problems involving changing numbers while keeping a ratio constant. If the product of two variables is a constant, the two are inversely proportional - in this case x If one variable is a product of the other variable and a constant, the two variables are called directly proportional - in this case x/y is a constant ratio. ![]() ![]() From mathematics, a proportion is simply two ratios in an equation, for example 1/2 = 50/100, 75/100 = 3/4, 9/10 = 90/100.
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