Question

check whether 3:9 and 4:12 are in proportion or not .​

Answer 1

Step-by-step explanation:

$3 \ratio \: 9 ::4:12 \\ \frac{3}{9} = \frac{4}{12} \\ \cross \multiplication \\ 36 = 36$

So,3:9::4:12 are in proportion

Answer 2

Answer:

$\huge\bold{Gíven-}$

3:9::4:12

Step-by-step explanation:

$\huge\bold{Answer-}$

3:9=4:12

product of mean = product of extreme

= 9×4=3×12

= 36=36

$\bold\red{hence,they\:are\:proportional\:to\:each\:other}$