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Published byDaniella Cox Modified over 9 years ago

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Ratio, Rate, Proportion, and Percent

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Ratio Comparison of two numbers by division Can be written three different ways 4 to 9 4 : 9 4 9

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Rate A ratio that compares two quantities measured in different units. 120 miles 3 hours

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Unit Rate A rate with a denominator of 1. If 120 miles, then the unit rate is 40 Miles 3 Hours 1 Hour When you want to find unit rate you divide

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Proportion Two equal ratios. 2 = 4 3 6

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Solving Proportions Cross Multiply then Divide 7 = 14 4 n 14 4 = 56 56 ÷ 7 = 8 N = 8

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Are these True Proportions? 8 = 12 12 8 Check the cross products 8 8 = 64 12 12 = 144 64 does not equal 144, therefore the proportions are not equal

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Is the proportion true? 2 = 5 10 25 Check the cross products 10 5 = 50 2 25 = 50 The proportion is true!

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Percent A ratio that compares a number to 100. 50 is 50% 100

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