Final answer:
By setting up a proportion using the scale 1/4 inch = 15 feet and the scale measurement of 9 inches, we find the actual measurement to be 135 feet.
Step-by-step explanation:
The scale of a drawing is 1/4 inches equals 15 feet. To find the actual measurement of the original drawing when the scale drawing is 9 inches, we can set up a proportion to compare the scale to the actual measurement:
1/4 inch / 15 feet = 9 inches / x feet
To solve for x, we can cross-multiply:
(1/4) * x = 9 * 15
Now we divide both sides of the equation by (1/4) to isolate x:
x = (9 * 15) / (1/4)
x = 135 feet
Therefore, the actual measurement of the original drawing is 135 feet.