0.2:x=0,7:0.105

Interpret as a proportion: 0.2 : x = 0.7 : 0.105, i.e., 0.2/x = 0.7/0.105.

Cross-multiply: 0.2 × 0.105 = 0.7 × x 0.021 = 0.7x x = 0.021 / 0.7 = 0.03

So, x = 0.03 (or 3/100). Quick check: 0.2/0.03 ≈ 6.6667 and 0.7/0.105 ≈ 6.6667.