Hi

Let x represent

Determining 'hat size' from the size of the head is an excellent example of 

a direct proportion between Hat size and Head circumference.

that is: hat size = k*Head size OR k =hat size/head size , where k is a constant.

 Or hat size = .318*head size(in)

  OR hat size = .12*head size(cm)



Hat size 7 1/8  (7.125)

(7 1/8) = .318*head size(in) 

 7.125/.318 = 22.4in

(7 1/8) = .125*head size(cm) 

7.125/.125 = 57cm 

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