0,5:2 = 1 целая 1/3 : x

пропорция

0.5 : 2 = 1 1/3 : x

0.5x=2 * 1 1/3

0.5x = 2 * 4/3

1/2x = 8/3

x = 8/3 : 1/2

x = 8/3 * 2/1

x = 16/3

x = 5 1/3

Ответ: х = 5 1/3

Проверка:

0.5 : 2 = 1 1/3 : 5 1/3

0.25 = 4/3 * 16/3

0.25 = 1/4

0.25 = 0.25