If x, y and z are positive numbers and (x2 + y2) ∶ (y2 + z2) ∶ (z2 + x2) = 13 ∶ 25  20, then x  z = 

1
 3  4
2
∶ ∶ 4
3
 3  2
4
∶ ∶ 3

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