An equation that sets two ratios equal to each other is called a proportion. In a proportion, the cross products of the ratios are equal. For example, in the proportion ( \frac{a}{b} = \frac{c}{d} ), the cross products are ad and bc, and they are equal. Solving proportions involves finding the missing value in one of the ratios by setting up and solving a simple equation.
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Ratios that are equal to each other can be 3/4=75/100 or 1/4=25/100
An equation consists of two expressions that equal each other.
An equation
-- take two quantities that are equal to each other -- write them both on the same line, with an "equals" sign between them ( = ) You now have an equation.
When two expressions are equal to each other they form an equation.