Check whether the given ratios are equal, i.e., they are in proportion. If yes, then write them in the proper form.
$$2:9$$ and $$18:81$$.
ratio $$2/9 = 2:9 = 0.22$$
ratio $$18/81 = 18:81 = 0.22$$
so , yes they are in proportion.
$$2/9 : 18/81$$ - proper form