Question

From the similar triangles in the diagram, write a proportion using the ratio WX/WV

Answer 1

The 3 similar triangles shown in the figure are:

a) Triangle WXV 
b) Triangle WVY
c) Triangle VXY

For the similar triangles, the ratio of their corresponding sides is always equal.

From Triangle WXV, we are given the ratio WX/WV. 
The side corresponding to WX, in Triangle WVY will be WY and side corresponding to WV will be WY.

So, we can write:

WX/WV = WV/WY

Moreover,
The side corresponding to WX, in Triangle VXY will be VX and side corresponding to WV will be VY.

So, we can write:

WX/WV = VX/VY

From these two equation, we can write:

VX/VY = WV/WY

So, option B gives the correct answer

Answer 2

The similarities are VWX ~ YVX ~ YWV. Matching corresponding letters, you have
  WX/WV = VX/VY = WV/WY

The appropriate choice is ...
  B. VX/VY = WV/WY