what's the ratio 15 feet to 1.46 inches

Question

It's for measuring a floor plan print that is dimensioned in inches and plotted out on a F-size paper.

when I measure a roll-up door on the floor plan, it measures 1.46 inches even the the dimension says

it's 15 feet. Whats the Ratio? 

 

          Thank You! (A.R.)

Answer 1

15 ft = 180 in

180 : 1.46

 

Could be calculate to 1 foot or 1 inch, yet number would be unwieldy.