Question

a/b = c/d..
is it proportional to:
a. a/c=b/d? (yes or no)
b. d/b=c/a? (yes or no)
c. c/b=a/d? (yes or no)
d. a/d=c/b? (yes or no)

Answer 1

cross multiply each of the proportions, and see which are same

Answer 2

a/b = c/d

=>

ad = bc

Answer 3

next do the same for given options, and see which ones are the same

Answer 4

a. a/c=b/d? (yes or no)

cross multiplying :-

ad = bc

so YES

Answer 5

there is one more option, see if u can find it

Answer 6

So, after cross multiplying, the both sides must be equal ?:) @ganeshie8

Answer 7

nope,
after cross multiplicaiton u should get "ad = bc" which is the GIVEN.

Answer 8

try option b, and tell me wat u get after cross multiplying

Answer 9

Oh, alright, I had answers but I wasn't so sure. Thanks :)

Answer 10

what if its..
\[\frac{ a+b }{ b } = \frac{ c+d }{ d }\] ?
It will be..
(a+b)(d) = (c+d)(b) and what's the next step? @ganeshie8

Answer 11

wat you trying to do here ?

Answer 12

(a+b)(d) = (c+d)(b)

ad + bd = bc + bd
ad = bc

Answer 13

so yes, this also is same as given proportion

Answer 14

oh thanks ;)

Answer 15

you may also look at it this way :-

\(\large \frac{ a+b }{ b } = \frac{ c+d }{ d }\)

\(\large \frac{ a }{ b } + \frac{ b }{ b } = \frac{ c }{ d } + \frac{ d }{ d } \)

\(\large \frac{ a }{ b } + 1 = \frac{ c }{ d } + 1\)

\(\large \frac{ a }{ b } = \frac{ c }{ d } \)

which is same as given proportion !

Answer 16

oh yeah, so informative, thanks again :DD

Answer 17

np :)