Proportions review

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Proportions review

  1. 1. Example: 2 6 Write the original proportion. 3 9 9 2 6 3 Use the cross product property. If the cross products are equal, then 18 18 it is a proportion.
  2. 2. Example: 2 6 Write the original proportion. x 9 9 2 6 x Use the cross product property. 18 6x Divide both sides by 6 to isolate the 6 6 variable, then simplify. 3 x
  3. 3. If the model is 5 inches tall, how tall is the actual building in feet? To find the actual height of the building, use the ratio from the previous step to write a proportion to represent the question above. 4 inches 5 inches 15 feet x 4 x 5 15 Use the cross product. 4x 75 Isolate the variable, then simplify. 4 4 x 18.75 feet Don’t forget your units.

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