What happens to the levitating height when more magnets are added?

[says]

Imagine one magnet levitating above another. Now imagine another 3 magnets are added to the bottom magnet (image below). What would happen to the levitating height?

I'd imagine the levitating height would increase and the force would increase by 4 times. I had a quick look online but I couldn't find a direct relationship about levitating height.

 

[A.T.]

http://www.kjmagnetics.com/blog.asp?p=doubled-forces