How to write a real world problem that could be solved using proportions

U can use  real world numbers and problems to help 

You could used building measurements, like the building is 85 ft tall and 45 ft wide, and the second build is 67 ft tall, find the width of the second building. Set up a proportion with the first building measurements and the second building measurements using x for the missing width.

Bc equals mb that should be your answer