Question 1032571
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the cape Hatteras lighthouse on the outer banks of north Carolina is the tallest lighthouse in north america. 
if a 5 foot woman casts a 12 foot shadow and the lighthouse casts a 54 foots shadow, approximately how tall is the cape Hatteras lighthouse
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It is about similar triangles . . . 

Solve the proportion {{{5/12}}} = {{{x/54}}} for the unknown height  "x" of the Hatteras lighthouse, and you will get 

x = {{{5*54/12}}} = . . . 

But of course, calculate it yourself.
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Thanks to the other tutor pointing in non-realistic input to this problem.