Question

Show that given ratio are in proportion

$7.5litres:15litres=5kg:10kg$
$99kg:45kg=rs44:rs20$
$32m:64m=6sec:12sec$

Answer 1

Condition for $a:b=c:d$

to be in Proportion is $ad=bc$

$7.5:15=5:10$

$7.5\left(10\right)=5\left(15\right)$

$75=75$

They are in Proportion.

$99:45=44:20$

$99\left(20\right)=45\left(44\right)$

$1980=1980$

They are in proportion.

$32:64=6:12$

$32\left(12\right)=6\left(64\right)$

$384=384$

They are in proportion.