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Section 6.4 Ration, Proportion, and Variation

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Section 6.4 Ration, Proportion, and Variation

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    1. 6/15/2012 Section 6.4 1 Section 6.4 Ration, Proportion, and Variation Objectives Solve proportions. Solve problems using proportions. Solve direct variation problems. Solve inverse variation problems.

    2. 6/15/2012 Section 6.4 2 Proportions Ratio compares quantities by division. Example: a group contains 60 women and 30 men. The ratio of women to men is: Proportion is a statement that says two ratios are equal:

    3. 6/15/2012 Section 6.4 3 Example 1 The Cross-Products Principle for Proportions If a = c then ad = bc. (b ? 0 and d ? 0) b d The cross products ad and bc are equal. Solve this proportion for x:

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