Math Question

[Shawn W.]

I don't understand what they want me to do in this math problem (see below). how do I set it up?

 

[Quaid]

I don't understand what they want me to do

The first three words say what they want you to do.

how do I set it up?

Hint: "[the height of the toy] is to [the height of the adult] as the [short length of the scale] is to [the long length of the scale]"