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已知\(O\)为坐标原点，\(\overrightarrow {O{Z_1}} \)对应的复数为\( - 3 + 4{\rm{i}}\)，\(\overrightarrow {O{Z_2}} \)对应的复数为\(2a + {\rm{i}}\)（\(a \in R\)）.若\(\overrightarrow {O{Z_1}} \)与\(\overrightarrow {O{Z_2}} \)共线，求\(a\)的值．
参考答案：\( - \frac{3}{8}\)
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