scale drawings and models

[drobles]

if 1.5 inches = 2 feet what does 12 3/4 inches = to?

 

[Mrspi]

if 1.5 inches = 2 feet what does 12 3/4 inches = to?

Set up a proportion:

(inches on drawing) / (inches in real life) = (inches on drawing) / (inches in real life)

You know that 1.5 inches on the drawing is equal to 2 feet in real life. You are asked what 12 3/4 inches on the drawing would be equal to in real life. Substitute into the proportion:

1.5 inches / 2 feet = 12 3/4 inches / x feet

You might want to write 12 3/4 inches in decimal form first...write 3/4 as a decimal.

Then solve the proportion.