Number pattern: find the step (difference) between consecutive terms.

Pattern	=	1.2, 1.4, 1.6, ?, ?, 2.2
Find the difference: 1.4 - 1.2 = 0.2, 1.6 - 1.4 = 0.2. The pattern adds 0.2 each step.
Third term	=	1.6 + 0.2 = 1.8
Fourth term	=	1.8 + 0.2 = 2.0
Check: 2.0 + 0.2 = 2.2. Matches the last given term.