. A Boeing 747 jet is approximately 230 ft long and has a
wingspan of 195 ft. If a scale model of the plane is about
40 cm long, what is the model’s wingspan?
The wingspan must be 195/230 = 84.78% of the model's length.
40 cm x 0.8478 = ___
You don't have to worry about converting feet to cm first. Only the ratio of wingspan to length is impostant.