Answer:
9
Explanation:
See the attachment.
Convert all terms into fractions having common denominators.
Then invert the denominator and multiply. Cancel terms where possible.
(99/9)/(11/9)
(99/9)*(9/11) = 9
(63/3)/(7/3)
(63/3)*(3/7) = 9
(45/5) = 9
Constant of proportionality is 9 in all cases.