Let's suppose we need to find the height of a pole, but it is rather difficult on us to measure vertically let's consider the following alternative.
Problem: You are standing close to a pole. At the same time of the day you cast a shadow of x meter and the pole of y meters. We know your height to be h meters, find the height T of the pole.
Solution: Using proportions to solve the problem,
h/x=T/y=>T=(h*y)/x
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