Determine if 2.25/10 ?= 9/40' 2.5/10 ?= 90/40' or 2.25/12 ?= 90/40 is a proportion.
A. None of these sets of ratios is a proportion.
B. 2.25/10 = 9/40
C. 2.25/12 = 90/40
D. 2.5/10 = 90/40
B. 2.25/10 = 9/40
This set of ratios is a proportion because when cross multiplied, both sides are equal:
2.25 * 40 = 10 * 9
90 = 90