use cross products to determine with ratio forms a proportion with 9/4.
A.5/3
B.27/12
C.36/20
D.18/4
To determine which ratio forms a proportion with 9/4 using cross products, we need to find the cross product of each ratio with 9/4.
For option A, the cross product would be (5 * 4) / (3 * 9) = 20/27, which is not equal to 9/4.
For option B, the cross product would be (27 * 4) / (12 * 9) = 108/108 = 1, which is not equal to 9/4.
For option C, the cross product would be (36 * 4) / (20 * 9) = 144/180 = 4/5, which is not equal to 9/4.
For option D, the cross product would be (18 * 4) / (4 * 9) = 72/36 = 2, which is not equal to 9/4.
None of the given ratios form a proportion with 9/4.