allery$4$, $9$ और $12$ का चतुर्थानुपाती ज्ञात कीजिए।
A$18$
B$21$
C$24$
D$27$
Answer & Solution
Correct answer: D. $27$
यदि $4 : 9 = 12 : x$ है, तो बाह्य पदों का गुणनफल = मध्य पदों का गुणनफल के नियम से, $4x = 9 \times 12 = 108$, इसलिए $x = 27$।
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