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SOLVING PROPORTIONS

SOLVING PROPORTIONS. proportion-. Words: an equation that shows that two ratios are equivalent. Symbols :. =. ,. b. 0,. d. 0. One way to determine whether two ratios form a proportion is to find their cross products.

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SOLVING PROPORTIONS

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  1. SOLVING PROPORTIONS

  2. proportion- • Words: an equation that shows that two ratios are equivalent • Symbols: = , b 0, d 0

  3. One way to determine whether two ratios form a proportion is to find their cross products. If the cross products of two ratios are equal, then the ratios form a proportion. 18 18 =

  4. Property of Proportions • Words: the cross products of a proportion are equal • Symbols: If then ad = bc. = ,

  5. If one value in a proportion is unknown, you can use equivalent fractions to solve the proportion. x 6 z 30 = = x 6

  6. You can use proportions to make predictions. 8 out of 10 dentists prefer Crest. There are 150 dentists in a certain city. Predict how many of them prefer Crest. x 15 prefer Crest prefer Crest = x 15 total total d 120 prefer crest =

  7. According to the results of a survey, 27 out of 50 people exercise regularly. Suppose there are 2600 people in a community. How many of these people can be expected to exercise regularly. exercise regularly exercise regularly x 52 = x 52 total total p 1,404 people =

  8. If one value in a proportion is unknown, you can use cross products to solve the proportion. 4 z 10 2 = = 4z 20 = z 20 4 = z = 5

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