Найдите неизвестный член пропорции: a)3 2\5:х=6 4\5:1 1\3 б)7 1/3:2 1/2= 3 2/3:y В)4...

Решите задачу:

$a)\;3\frac25:x=6\frac45:1\frac13\\\frac{17}5:x=\frac{34}5:\frac43\\x=\frac{17}5\cdot\frac43:\frac{34}5=\frac{17}5\cdot\frac43\cdot\frac5{34}=\frac4{3\cdot2}=\frac46=\frac23\\ b)\;7\frac13:2\frac12= 3\frac23:y\\\frac{22}3:\frac52=\frac{11}3:y\\y=\frac{11}3\cdot\frac52:\frac{22}3=\frac{11}3\cdot\frac52\cdot\frac3{22}=\frac5{2\cdot2}=\frac54=1\frac14$
$\\c)\;4\frac25:x=8\frac45:2\frac15\\\frac{22}5:x=\frac{44}5:\frac{11}5\\x=\frac{22}5\cdot\frac{11}5:\frac{44}5=\frac{22}5\cdot\frac{11}5\cdot\frac5{44}=\frac{11}{5\cdot2}=\frac{11}{10}=1\frac1{10}=1,1\\d)\;6\frac12:3\frac34=3\frac14:y\\\frac{13}2:\frac{15}4=\frac{13}4:y\\y=\frac{13}4\cdot\frac{15}4:\frac{13}2=\frac{13}4\cdot\frac{15}4\cdot\frac2{13}=\frac{15}{4\cdot2}=\frac{15}8=1\frac78$