please help me figure this out.
2007-09-03 20:43:08 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Ratio 1
21 : 8
210 : 80
Ratio 2
x :10
8x : 80
8x = 210
x = 210 / 8
x = 105 / 4
2007-09-07 20:10:07 · answer #1 · answered by Como 7 · 0⤊ 0⤋
If the first part of the first ratio is 21/2, then x = 26.25 (26 1/4)
If it's 2 1/2, then x = 6.25 (6 1/4)
2007-09-03 20:55:43 · answer #2 · answered by amanda 2 · 1⤊ 0⤋
A proportion is a name we give to a statement that two ratios are equal. It can be written in two ways:
two equal fractions
a/b = c/d
or,
using a colon,
a:b = c:d
When two ratios are equal, then the cross products of the ratios are equal.
That is, for the proportion,
a:b = c:d, a * d = b * c
So by substituing, we get
21/2 : 4 = x:10, 21/2 * 10 = 4x
So x = 25/4
2007-09-03 20:57:53 · answer #3 · answered by Christine P 5 · 0⤊ 0⤋
is it 21/2 (21 divided by 2) or is it 2 1/2 (two and a half)? because the 2 and 1 is written without space between them. if it's 2 1/2, x = 25/4 or 6.25 or 6 1/4
if it's 21/2, x = 105/4 or 26.25 or 26 1/4
there you go.
2007-09-03 20:59:33 · answer #4 · answered by clark k 2 · 1⤊ 0⤋
6 1/4
2 1/2 is 5/8 of 4
6 1/4 is 5/8 of 10
2007-09-03 20:51:48 · answer #5 · answered by Black&Orange 4 · 1⤊ 0⤋
21/2 : 4
21/8 = x :10
x=210/8 = 26.67
2007-09-03 21:00:27 · answer #6 · answered by Ganesh S 1 · 0⤊ 1⤋