1 2/7 : 5 1/7 = 2/3 : х
9/7 : 36/7 = 2/3 : х
9/7 · х = 36/7 · 2/3 - свойство пропорции
9/7 · х = (12·2)/(7·1)
9/7 · х = 24/7
х = 24/7 : 9/7
х = 24/7 · 7/9
х = 24/9 = 8/3
х = 2 целых 2/3
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Проверка: 9/7 : 36/7 = 2/3 : 8/3
9/7 · 7/36 = 2/3 · 3/8
9/36 = 2/8
1/4 = 1/4 - верно
