the figures above are similar find the missing length show your work

find the ratio ( scale factor ) of the 2 known sides
large box has length of 5, small box has length of 3
3 divided by 5 = 0.6
so now multiply the known height of large box (3) by 0.6 to find x
3 * 0.6 = 1.8
x = 1.8 inches
please mark brainliest.