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Answer:
 y = 3/4x
Step-by-step explanation:
The equation of a proportional relation is ...
 y = kx
The value of k can be found by dividing by x:
 y/x = k
For the given values, we find k to be ...
 k = y/x = (3 ft)/(4 turns) = 3/4 ft/turn
The relationship can be written ...
 y = 3/4x