$$\frac{ 4 }{ 7 } \frac{ 4 }{ 7 } \frac{ 9 }{ 7 }$$
$\frac{144}{343}\approx 0.419825073$
$$\frac{4\times 4}{7\times 7}\times \frac{9}{7}$$
$$\frac{16}{49}\times \frac{9}{7}$$
$$\frac{16\times 9}{49\times 7}$$
$$\frac{144}{343}$$
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$\frac{2 ^ {4} \cdot 3 ^ {2}}{7 ^ {3}} = 0.4198250728862974$
