Quantitative Aptitude Ratio and Proportion Componendo or Dividendo

For the value of 'k' (k>0), is subtracted from each of 30, 20, 12 and 11, the numbers obtained in this order are in proportion. Find the first proportional for (k2 - kz), (k + z) and (k2 - z2).

1
10
2
30
3
12
4
11

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