ratio and proportion?

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(3 / 8) = (X / 30)

2006-11-14 02:03:20 · 4 answers · asked by . 1 in Science & Mathematics ➔ Mathematics

Cross-multiply. 3 times 30 = 90, divided by 8 = 11.25

2006-11-14 02:06:59 · answer #1 · answered by Gary H 6 · 0⤊ 0⤋

You would want to cross multiply these to solve for "x"

3/8 = x/30

8x (8 times x) =90 (3 times 30)
x= 11.25 (divide 90 by 8)

2006-11-14 10:46:35 · answer #2 · answered by Anonymous · 0⤊ 0⤋

3/8=X/30
cross multiply
X=90/8 or 45/4

2006-11-14 11:39:54 · answer #3 · answered by grandpa 4 · 0⤊ 0⤋

3/8 = x/30
x = 3/8 x 30
x = 45/4
x = 13.75

2006-11-14 10:35:12 · answer #4 · answered by get2rohan_365 2 · 0⤊ 0⤋