Question 82887
A 6 FT. TALL MAN IS STANDING NEAR A TREE ON LEVEL GROUND. HIS SHADOW IS 4FT LONG. IF THE LENGTH OF THE TREE'S SHADOW IS EQUAL TO 18 FT.- HOW TALL IS THE TREE? 
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It's a proportion.
object/shadow = object/shadow
Your Problem:
x/18 = 6/4
x = 18(3/2)
x= 27 ft.
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Cheers,
Stan H>