Principles of Mathematics: A drawing of a neuron is at the scale 200 : 3

Question

I missed this class and I have a test on it tomorrow. I need help understanding the process of answering this question:

A drawing of a neuron is at the scale 200 : 3

a) If the cell body has a diameter of 6mm in the drawing, what is the actual diameter

b) What is the scale factor of the drawing

Answer 1

This is a straight proportion problem.

200/3 = 6/x => 200x = 18.

The scale factor is 200/3.