Question

How can you solve a proportion to find an unknown quantity?

Answer 1

solve \[\frac{ 6 }{ c+12 }= \frac{ 3 }{c }\]

Answer 2

Cross multiply and equate.

If a/b = c/d then ad = bc

Answer 3

ok?

Answer 4

yes...cross multiply
6/(c + 12) = 3/c
(6)(c) = (3)(c + 12)

you following me ?

Answer 5

yes

Answer 6

now multiply
(6)(c) = 3(c + 12)
6c = 3c + 36 -- subtract 3c from both sides
6c - 3c = 36
3c = 36
c = 12

check...
6/(c + 12) = 3/c
6/(12 + 12) = 3/12
6/24 = 3/12
1/4 = 1/4 (correct)

c = 12

any questions ?

Answer 7

no. thank u