A map has a scale of 1 cm : 15.5 km. Two cities are 2.3 cm apart on the map. To the nearest tenth of a kilometer, what is the actual distance corresponding to the map distance?
The proportion
1 cm 15.5 km
2.3 cm x km
1/2.3=15.5/x
x=2.3*15.5
x=35.65≈35.7 km