To find height $ h $ use formula:

$$ V = \dfrac{ h ^{ 2 } \cdot r \cdot \pi}{ 3 } $$

After substituting $V = 615.44\, \text{cm}$ and $r = 7\, \text{cm}$ we have:

$$ 615.44\, \text{cm} = \dfrac{ h ^{ 2 } \cdot \left( 7\, \text{cm} \right)^{4} \cdot \pi}{ 3 } $$$$ 615.44\, \text{cm} \cdot 3 = h ^{ 2 } \cdot \left( 7\, \text{cm} \right)^{4} \cdot \pi $$$$ 1846.32\, \text{cm} = 7\, \text{cm} \cdot h ^{ 2 } \cdot \pi $$$$ h ^{ 2 } = \dfrac{ 1846.32\, \text{cm}}{ 7\, \text{cm} \, \pi } $$$$ h ^{ 2 } \approx 83.9572 $$$$ h \approx \sqrt{ 83.9572 } $$$$ h \approx 9.1628 $$

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