Example 3 Using Similar Trlangles To comply with the Americans with Disabilities Act, wheelchair ramps made for new constructions must have a height to length ratio of 1:12. At a new construction, the height h to the bottom of a a door is 2.5 feet. Use the proportion b to estimate the length r that the ramp should be to have the correct slope ratio. In the proportion, use a = 1 ft and b 12 ft. h a Solution a h Write proportion. b r Substitute. r r =_ ft Answer The ramp should have a length of Cross product property feet.

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5. The students in Suzanne's school are painting a rectangular mural outside the building that will be 15 feet by 45 feet. A. Write the unit rate for the proportional relationship between lengths on the mural y and lengths in the scale drawing x. 6. The students at Suzanne's school are also going to paint a smaller mural inside the building. A scale drawing of the mural is shown on the grid. IT B. MP Model with Mathematics Write an equation that relates x and y. The diagonal of the scale drawing is approximately 6.3 units. Estimate the length of the diagonal of the mural. A. Redraw the inside mural on the grid using a scale of 1 unit:1 foot. A Ⓒ Houghton