Take the powers of 1.2 and round them up to one place of decimals and we get:
1, 1.2, 1.4 (1.44), 1.7 (1.728), 2.1 (2.0736), 2.5 (2.48832), 3.0 (2.985984), 3.6 (3.5831808), 4.3 (4.29981696), 5.2 (5.159780352), 6.2 (6.191736422), 7.4 (7.430083707), 8.9 (8.916100448) The numbers in brackets are actual or close approximations to the powers.