railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Ratio and Proportion Fourth Proportional

If the fourth proportional to ‘x + 3’, 8 and 27 is ‘x – 3’, then what is the positive value of ‘x’?

1
15
2
12
3
18
4
21
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