Did you know you can type an exact size when using the scale tool?
I was always sure typing in a multiplication or fraction were the only way to go, but apparently there's more.
After selecting the direction you want to scale in, you can type in a distance with units notation, for example: '100 cm' (Don't forget the space!) and the component will scale to 100 cm.
This saves lots of time and comes very handy when scaling Flex components too.
Checkout Justin's video to see how it's done: