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Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Chapter 5 Ratio, Proportion, and Measurement
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Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. 5.2 Proportions
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33 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Writing Proportions A proportion is a statement that two ratios or rates are equal. For example, is a proportion. We can read this as “5 is to 6 as 10 is to 12.”
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44 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Example Write the statement 12 diamonds is to 15 rubies as 4 diamonds is to 5 rubies as a proportion.
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55 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Determining Whether Proportions are True
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66 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Example Is a true proportion? Determine the cross products. Since the cross products are not equal. The proportion is false.
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77 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Finding Unknown Numbers in Proportions When one number of a proportion is unknown, we can use cross products to find the unknown numbers. Finding an Unknown Value n in a Proportion Step 1: Set the cross products equal to each other. Step 2: Divide the number not multiplied by n by the number multiplied by n.
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88 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Example Find the value of the unknown number n.
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99 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Example Find the value of the unknown number n.
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