Question

a scale model of a building has a width of 21 centimeters. the scale factor is 1:25. what is the actual width of the building in centimeters? use the keypad to enter your answer in the box. the actual width of the building is centimeters.

Explanation:

Step1: Set up the proportion

Let \(x\) be the actual width. The proportion is \(\frac{1}{25}=\frac{21}{x}\).

Step2: Solve the proportion

Cross - multiply: \(1\times x = 25\times21\). Then \(x=25\times21 = 525\).

Answer:

525