railway UPMRC SCTO 2024 Mock Test Quantitative Aptitude Ratio and Proportion Mean Proportional

If x is added to each of 12, 28, 21 and 45, the numbers so obtained, in this order, are in proportion. What is the mean proportional between (x + 3) and (4x + 1)?

1
15
2
18
3
12
4
10
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