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Understanding Proportions: How to Find and Solve

Learn what a proportion is and how to find them using ratios and cross products. Follow step-by-step instructions with examples to master the concept of proportions easily.

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Understanding Proportions: How to Find and Solve

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  1. How to find proportions By: deonta brown

  2. What a proportion is • A proportion is simply a statement that two ratios are equal. The following proportion is read as "twenty is to twenty-five as four is to five.“ 25 4 20 5

  3. How to start it • It can be written in two ways: as two equal fractions a/b = c/d; or using a colon, a:b = c:d a c b d

  4. Step 1 • The following proportion is read as "twenty is to twenty-five as four is to five.“ 20 4 25 5

  5. Step 2 • cross products of a proportion, we multiply the outer terms and the middle terms

  6. Step 2 • Here, 20 and 5 and 25 and 4 Since the cross products are both equal to one hundred, we know that these ratios are equal and that this is a true proportion. • 20x5=25x4 • cross products 100=100 20 4 25 5

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