Use a proportion to solve the problem.?

i tried but i can figure this out please help.





A building casts a shadow 31 m long. At the same time, the shadow cast by a 37-cm tall pole is 58 cm long. Find the height of the building.





A. 19.8 m


B. 47.1 m


C. 18.3 m


D. 48.6 m

Use a proportion to solve the problem.?
Let x = height of building





x/31 = 37/58





x = (37)(31)/(58) = 19.8 m


ans. A.





that's it! :)
Reply:x/31=37/58


1. 31x37=1147


2. 1147/58=19.8





So the answer is A
Reply:x/31= 37/58


58x = 31*37


x = 31*37/58 = 19.8 m
Reply:Draw the pictures





|_





|


|__





The fact that the measure are different doesn't matter here. Set the proportion as the height of first/height of second = shadow of first/shadow of second.





x/37 = 31/58


Multiply both sides by 37.





x = 19.8m