$$470 \sqrt{ \frac{ 1 }{ 470 \times 21 } }$$
$\frac{\sqrt{9870}}{21}\approx 4.730851126$
$$470\sqrt{\frac{1}{9870}}$$
$$470\times \frac{\sqrt{1}}{\sqrt{9870}}$$
$$470\times \frac{1}{\sqrt{9870}}$$
$$470\times \frac{\sqrt{9870}}{\left(\sqrt{9870}\right)^{2}}$$
$$470\times \frac{\sqrt{9870}}{9870}$$
$$\frac{\sqrt{9870}}{21}$$
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