Today there are 100 steps for the good and 60 steps for the bad Follow it. What's the geometric step? I know it's 250 steps, but I don't know how to calculate it Using equation

Today there are 100 steps for the good and 60 steps for the bad Follow it. What's the geometric step? I know it's 250 steps, but I don't know how to calculate it Using equation

Let x step catch up
x/100 ×60+100=x
The solution is x = 250