I am looking for Golden Ratio formulas. Google searches only provide width from known height or height from known width.

Instead, what I want to calculate is:
  1. width from known area
  2. height from known area


(For more information on Golden Ratio, try google or the websites below:
http://elliotwaite.com/golden-ratio-calculator/
http://www.mathsisfun.com/numbers/golden-ratio.html