Finding the furthest perpendicular point between two lines

Is there an easy way to wind the maximum perpendicular point between two lines? 

I'm trying to find the maximum perpendicular distance between two lines and the measure tools don't seem to have a function for this. I'm currently copying parallel to find the point but it's a bit slow and imprecise, is there a better way of doing this?

The attached image should show what I'm trying to do.