№ 6. Найдите неизвестный член пропорции.

1) 6 : x = 36 : 30 => x = 6 * 30 / 36 = 5. 2) 12 : 7 = 3 : x => x = 3 * 7 / 12 = 1,75. 3) 4,9 : 0,35 = x : 35 => x = 4,9 * 35 / 0,35 = 490. 4) x / 21 = 9 / 14 => x = 9 * 21 / 14 = 13,5. 5) x / 16 = 3 / 8 => x = 3 * 16 / 8 = 6. 6) 108 / 90 = 42 / x => x = 90 * 42 / 108 = 35.