If r = frequency ratio, D = damping ratio, then magnification factor in a damped forced vibration is equal to:

- 1
  
  $1 / \sqrt{{(1 - r^{2})}^{2} + 4 r^{2} D^{2}}$
- 2
  
  $1 / \sqrt{{(1 - r^{2})}^{2} + 4 D r}$
- 3
  
  $1 / \sqrt{{(1 - r^{2})}^{2} - 4 r^{2} D^{2}}$
- 4
  
  $1 / \sqrt{{(1 + r^{2})}^{2} - 4 r^{2} D^{2}}$

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