9/2.5=((100-x)/((100-x)^2+50^2)^0.5)/((x)/(50^2+x^2)^0.5)

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.