Set up and Label the proportion

Answer and round your answer to the nearest whole number.

A 6 ft tall tent standing next to a cardboard box casts a 9 ft shadow. If the cardboard box casts a shadow that is 6 ft long then how tall is it?

2 answers

6/9 = x/6 or 6:9::x:6

Either way, solve for x.
6 feet tall