Question

Найди неизвестный член пропорций 1)
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$x \div \frac{8}{9} = 3 \div 4$
$x \div 2 .8 = 5 \div 7$
$12 \div 7 = 9 \div x$
$6.5 \div 5.2 = x \div 8$
$4.5 \div 3.6 = \times \div 4$
$15 \div 4 = x \div 1 \frac{1}{3}$