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Published byIsabella Bond Modified over 8 years ago

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PERCENT PROPORTIONS Using Proportions 4-1

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Vocabulary Review Ratio: The comparison of two numbers (written in Algebra as a fraction) Proportion: When two ratios are equal to each other Cross Product(s): When we cross multiply/compare diagonally, the special relationship between two ratios in a proportion

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Percent Proportions Proportions can be used to solve missing percentages of a number… “is #” = given/missing % “of #” 100%

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Percent Proportions Ex. Find 30% of 24. Is # = Of # = Given/missing % = Write out proportion… x = 30% 24 100% *Round answer to nearest tenth of percent! Ex. What percent is 20 of 210? Is # = Of # = Given/missing % = Write out proportion… = 100% *Round answer to nearest tenth of percent! We use the same steps to solve… 1) Cross multiply 2) Cross multiply 3) Divide to solve

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Percent Proportions Ex. What is 33 1/3 % of 150? x = 33.3% 150 100% Ex. 5 is 80% of what number? 5 = 80% x 100%

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Practice A) 6% of what number is 2.46 B) What percent of 72 is 27? C) Find 72% of 310.

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Homework p. 161 #9-20 all (Calculator okay!) Show set up/process/work

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