Difference in Price Between 3 and 4 Bedroom House

All things being equal, is there a rule of thumb as to the price difference betwen a 3 bedroom and a 4 bedroom house? i.e. 10%, 20% etc.

Responses will be greatly appreciated. :)
 
I bought a 3 bed house recently in a predominately family area for $435,000 in a culdesac. At the same time 4 bed houses, approx same size house and smaller yard, not cul-de-sac were selling for closer to $485,000.
 
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