Question
If the third proportional to 50 and Z is 18, then what is the value of Z?
This question was previously asked in
RRB Group D 2024 Question Paper PDF (27-Dec-2025) (Shift 2)
The correct answer is
30
If the third proportional to \(a\) and \(b\) is \(c\), then \(a : b = b : c\), which gives \(b^2 = ac\).
Here \(a = 50\), \(b = Z\), and \(c = 18\). So \(Z^2 = 50 \times 18 = 900 \Rightarrow Z = 30\).
The correct answer is : 30.
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