Proportions
Proportions: A proportion is an equation that states that two ratios are equal.
Equivalent Ratios: If one of the numbers in a proportion is unknown, you can solve the proportion to find the unknown number. One way to solve a proportion is to use mental math to find an equivalent ratio.
Using Algebra: You can use the same methods you used to solve equations to solve proportions that have a variable in the numerator.
Every pair of ratios has two cross products. A cross product of two ratios is the product of the numerator of one ratio and the denominator of the other ratio.
Cross Products Property: The cross products of a proportion are equal.
Read the explanation below to learn more about proportions.
Practice: Answer the following exercises about proportions.