  A ratio is a way to compare two quantities that are measured in the same units by using division  45 : 100 Ratio.

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Presentation transcript:

  A ratio is a way to compare two quantities that are measured in the same units by using division  45 : 100 Ratio

  A proportion is an equation that states that two ratios are equal.  45 /100 = 90 / 200 Proportion

  To solve a proportion you must:  First cross-multiply  45/ 100 = x / 200 Solving Proportions

  Multiply the denominator of the first by the numerator of the second  45 / 100 = x / 200

  Then multiply the numerator of the first by the denominator of the second  45 / 100 = x / 200

  Make them equal:  45(200) = 100(x)

  Solve.  100x = 9000

  Since x is being multiplied by 100,  to solve we must now divide by 100 to get x by itself

  What you do to one side of the equal sign, you must do to the other side of the equal sign

  100x / 100 = 9000 / 100

  X = 90 Our Proportion is solved