How do you solve the proportional $\frac{9}{r} = \frac{3}{10}$ $9/r=3/10$ ?

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Answer 1 · 2016-11-11T06:31:16

Cross-multiply and solve.

$\frac{9}{r} = \frac{3}{10}$ $9/r=3/10$

$r \times 3 = 3 r, and 9 \times 10 = 90$ $rxx3=3r, and 9xx10=90$

$3 r = 90$ $3r=90$

$r = 30$ $r=30$

How do you solve the proportional 9r=3109/r=3/10?