Quantitative Aptitude Ratio and Proportion Mean Proportional

The mean proportional of 4a2 and x is \(\frac{1}{5a}\) where a is a positive number, then the value of x is ____.

1
\(\frac{1}{100a^4}\)
2
\(\frac{1}{100a^2}\)
3
\(\frac{1}{25a^2}\)
4
\(\frac{1}{25a^4}\)

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