flash maths - scaling a number

hi guys,

i need math problem

i need math formula scale number between 400 , 10000
to number between 800 , 8000

in other words 400 return value of 800
10000 return value of 8000
and number between 400 , 10000
would return corresponding answer between
800 , 8000 same percentage along span of numbers.

for example number half way between 400 , 10000
would return number half way between 800 , 8000

var destlow:number = 800;
var desthigh:number = 8000;
var origlow:number = 400;
var orighigh:number = 1000;

var num:number = 500;

var newnum = destlow+(num-origlow)/(orighigh-origlow)*(desthigh-destlow);

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