A cellular telephone tower casts a shadow that is 72 feet long. while a nearby tree that is 27 feet tall casts a shadow that is 6 feet long. how tall is the tower?

Shadow length is proportional to object height.

(tower height) / (tower shadow length) = (tree height) / (tree shadow length)

(tower height) / (72 ft) = (27 ft) / (6 ft)

(tower height) = (72 ft) * (27/6)

(tower height) = 324 ft

The cellular telephone tower is 324 ft tall.