If you use Photoshop you probably appreciate the "Constrain Proportions" checkbox found in some of the application's dialogs and menus.

I like to have this same ability when I'm writing ActionScript to resize objects proportionately too.
Here I use the functions to set the sizes so when I set width, height is changed accordingly.
The same for setting height, the width is changed accordingly.

*Note: I set the inputs to limit the width and height to 500.

Here are two functions for performing proportional resizing by both width and height...
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