Use cross products to determine which ratio forms a proportion with 9/4?
5/3
27/12
36/20
18/4
To determine which ratio forms a proportion with 9/4 using cross products, we need to calculate the cross product for each of the ratios given.
For the ratio 5/3:
Cross product = (5 * 4) = 20
Since the cross product for the ratio 5/3 is not equal to the cross product of 9/4, they do not form a proportion.
For the ratio 27/12:
Cross product = (27 * 4) = 108
Since the cross product for the ratio 27/12 is not equal to the cross product of 9/4, they do not form a proportion.
For the ratio 36/20:
Cross product = (36 * 4) = 144
Since the cross product for the ratio 36/20 is not equal to the cross product of 9/4, they do not form a proportion.
For the ratio 18/4:
Cross product = (18 * 4) = 72
Since the cross product for the ratio 18/4 is equal to the cross product of 9/4, they form a proportion.
Therefore, the ratio 18/4 forms a proportion with 9/4.