I know someone is going to come up with a simple solution to a problem I'm having...

I need to divide a given length (x) by a number (a) to give me a value between (y) and (z)

e.g

x = 3312
y = 181.6
z = 188.39

a = 18

Result = 184

I did that just with basic math and a bit of human brain power "fuzzy logic" and an educated guess...

Anyone got any ideas how I might go about doing this in php, the code I imagine will be easy it's just am getting lost in while's, if's and then's ....

Please help my sanity !!!!!

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Thanks... Simon