Consider the combination of two capacitors $C _ { 1 }$ and $C _ { 2 }$, with $C _ { 2 } > C _ { 1 }$, when connected in parallel, the equivalent capacitance is 10 times the equivalent capacitance of the same connected in series. Calculate the ratio of capacitors, $\frac { C _ { 2 } } { C _ { 1 } }$.
(1) $4 + \sqrt { 15 }$
(2) $2 + \sqrt { 15 }$
(3) 9
(4) $\frac { 15 } { 4 }$