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Solving Proportions - PowerPoint PPT Presentation

Solving Proportions. Section 5.2. Objectives. Determine whether a proportion is true or false Solve a proportion. Objective 1: Determine whether a proportion is true or false. Objective 1. Proportions states two ratios are equal

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Solving Proportions

Section 5.2

• Determine whether a proportion is true or false

• Solve a proportion

Objective 1: Determine whether a proportion is true or false

• Proportions states two ratios are equal

• Cross multiplication – checks whether proportion is true or false

• Cross multiplication is shortcut for converting both fractions to have common denominator and checking that numerators match

• To check whether proportion is true or false

• Check that ratios or rates have same units

• Cross multiply

• If cross products are equal, proportion is true

Objective 2:Solve a proportion

• If three numbers of proportion are given, you can find the fourth

• To solve a proportion

• Cross multiply

• Do related division to find missing number