<h2>
Explanation:</h2>
Hello! Remember you have to write complete questions in order to get good and exact answers. Here you haven't provided any sector, so I'll help you in a general way and providing my own example.
A sector is a region of a circle between two radii. Suppose you have a central angle
degrees, the sector can be found as:

Suppose that the radius of the circle is
and the central angle is 90 degrees, therefor the sector is:

Answer:
The constant of proportionality is 3 because for every 1 female bear there are 3 cubs and vice versa.