I can't work out what you mean but it doesn't sound a sensible calculation to try and make in your head when you are trying to intercept an ILS. The 1 in 60 (ie 1 degree) rule leads to an approximation of a 3 degree glideslope being 3000' AAL at 10 miles, 4500' at 15 miles etc. Otherwise who cares what other distances are involved- concentrate on flying the aeroplane right! What you want to work out is not possible.