Home › CMA Foundation › businessmathematics › Continued Proportion › If a, b, c are in continued proportion, then b² …
If a, b, c are in continued proportion, then b² equals:
Aa − c
Ba + c
C(a + c)/2
Da × c
Answer & Solution
Correct answer: D. a × c
1. Per OCR: "If 3 quantities are in continued proportion then we get b² = ac."
2. Mean proportional formula: b = √(ac).
3. For 3, 6, 12: 6² = 36 = 3×12. ✓
_Source: ICMAI BoS CMA Foundation Paper 3 (FBMS) — Paper3_07042026.pdf, Module 1 §1.1 (page 12)_