Proportions Explanations and Definitions

A proportion is an equation that states that two ratios are equal. It is written in the form a/b = c/d, where a, b, c, and d are all numbers. The two ratios can be written as fractions, decimals, or percents. Proportions can be used to solve many types of problems, such as finding the missing value in a proportion. For example, if a/b = c/d, and b and d are known, then a and c can be found by solving the proportion.