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Proportions are often used in mathematics to solve for unknown quantities. By setting up a proportion, you can use the information you have to find missing values. For example, if you know that a recipe calls for 2 cups of flour for every 3 cups of sugar, and you have 6 cups of sugar, you can use a proportion to find out how much flour you need.
Proportions can also be used in real-life situations, such as calculating distances on maps or determining the size of objects in a photograph. They are a useful tool for comparing and analyzing different quantities and can help you solve a variety of problems.