On a scale drawing of a swimming pool, 1 inch equals 4 feet. The actual dimensions of the swimming pool are 15 feet by 30 feet. What are the dimensions of the swimming pool in the scale drawing? Explain your answer.
Accepted Solution
A:
We are dealing with a scale drawing, so the measurements of the actual pool and that of the drawing are directly proportional. If 1 inch on the drawing equals to 4 feet in real life, then the scale factor from sale drawing to the actual dimensions is ×4. However we need the scale factor from the actual dimensions to those on the scale drawing. This value will be the reciprocal (1 over a given number) of the small to large scale factor, so is ×1/4, a.k.a a quarter. Now we can find the scale drawing dimensions of the swimming pool by doing: [tex]actual \: dimension \times \frac{1}{4} [/tex] (and don't forget to use inches as the measurement for the scale drawing): [tex]15 \times \frac{1}{4} = \frac{15}{4} = 3.75[/tex] So 15 feet = 3.65 inches [tex]30 \times \frac{1}{4} = \frac{30}{4} = 7.5[/tex] And 30 feet = 7.5 inches.