state if each pairs of ratios forms a portion
4/2 and 20/6. 3/2 and 18/8
The pairs of ratios form proportions if the cross products are equal.
For 4/2 and 20/6:
Cross products: (4)(6) = 24 and (2)(20) = 40
Since the cross products are not equal (24 ≠ 40), this pair of ratios does not form a proportion.
For 3/2 and 18/8:
Cross products: (3)(8) = 24 and (2)(18) = 36
Since the cross products are not equal (24 ≠ 36), this pair of ratios does not form a proportion.