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In this lesson, you will learn what a proportion is, how to solve proportions, and how to calculate the value of a proportion. A ratio is the comparison between two numbers, and a proportion is when we set two ratios equal to one another. When we solve a proportion, we must learn how to solve an equation for the unknown variable. In this lesson, we describe what proportions are used for, how to set up a proportion as an equation, and how to use the concept of solving an equation to solve a proportion.