A flagpole casts a shadow 23.5 feet long. At the same time of day, Mrs.Gilbert, who is 5.5 feet tall, casts a shadow that is 7.5 feet long. How tall in feet is the flagpole? Round your answer to the tenths place.

Set this up as a Ratio and Proportion.
5.5/7.5=?/23.5
Multiply 5.5 x 23.5. Divide this answer by 7.5
You should get 17.23 and round to 17.2 ft.