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Lesson 7.4 Concept: How to use proportions to solve percent problems Guidelines:

Lesson 7.4 Concept: How to use proportions to solve percent problems Guidelines: We will use a basic formula…….. Part of Base # = % Base # 100.

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Lesson 7.4 Concept: How to use proportions to solve percent problems Guidelines:

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  1. Lesson 7.4 Concept: How to use proportions to solve percent problems Guidelines: We will use a basic formula…….. Part of Base # = % Base # 100 *Using cross products and isolation of a variable, we can find any missing piece of information in the formula. Plug the variable into the formula where the information is needed.

  2. Finding a Percent % Part of Base # = % Base # 100 What percent of 40 is 15? x 15 = 40 100 Solve using cross products 40x = 1500 40 40 x = 37.5%

  3. Finding a Percent % Part of Base # = % Base # 100 Your team won 19 of its 25 games. What percent of its games did it win? x 19 = 25 100 Solve using cross products 25x = 1900 25 25 x = 76%

  4. Finding a Percent % Part of Base # = % Base # 100 What percent of 75 is 30? x 30 = 75 100 Solve using cross products 75x = 3000 75 75 x = 40%

  5. Finding a Base number Part of Base # = % Base # 100 8 is 32% of what number? 32 8 = x 100 Solve using cross products 32x = 800 32 32 x = 25

  6. Finding a Base number Part of Base # = % Base # 100 15 is 75% of what number? 75 15 = x 100 Solve using cross products 75x = 1500 75 75 x = 20

  7. Finding Part of a Base number Part of Base # = % Base # 100 You buy a pair of pants on sale. The price is 80% of the regular price of $24.50. What is the sale price? 80 x = $24.50 100 Solve using cross products 100x = 1960 100 100 x = $19.60

  8. Finding Part of a Base number Part of Base # = % Base # 100 In a test of 450 people using Shiny Teeth Toothpaste, 76% had no new cavities after one year. How many people had no new cavities? 76 x = 450 100 Solve using cross products 100x = 34200 100 100 x = 342 people

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