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This is super simple I guess but my mind has gone blank.

I have these dimensions below, and I am trying to scale this rectangle to 610 wide

Width 560 Height 315

From these figures, how do I work out the percentage to scale the height so the rectangle is still at the same aspect ratio?


Think I got it...

560 / 100 = 5.6

610 / 5.6 = 108.92

Answer 108.92%

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up vote 0 down vote accepted

Since $\frac{610}{560} \doteq 1.089$, you have to scale by approximately $8.9$% (from 100% to 108.9%).

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That is so much simpler. Thanks – Joshc Jul 24 '12 at 10:03

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