Find the number three sixteenths of which is four ninths of 81.

Let’s calculate what is the number 4/9 of the number 81, making up the proportion and expressing in terms of h equal to four ninths:

81 – 1,

h – 4/9.

h = 81 * 4/9: 1;

h = 9 * 4: 1;

h = 36: 1;

h = 36.

Let’s find the required number by composing the proportion and expressing the required number in terms of f:

36 – 3/16,

f – 1.

f = 36 * 1: 3/16;

f = 36: 3/16;

f = 36 * 16/3;

f = 12 * 16;

f = 192 is the required number.

Answer: the required number is 192.