Fourth Proportional in Quantitative Aptitude – Find the Missing Term

Fourth Proportional in Quantitative Aptitude – Find the Missing Term

The concept of the fourth proportional is widely tested in ratio and proportion problems across competitive exams. If three numbers are given, the fourth proportional can be found using a simple relation.

📌 Problem Statement:

The fourth proportional to 4, 6, 8 is...?

🔑 Solution:

By definition:If a : b = c : d, then d is called the fourth proportional to a, b, c.

So here:

• a = 4, b = 6, c = 8

• Formula: d = (b × c) ÷ a

Substitute:d = (6 × 8) ÷ 4 = 48 ÷ 4 = 12

✅ The fourth proportional = 12

📹 Watch full explanation in the video below:

The fourth proportional to 4, 6, 8 is...?

🎯 Useful For These Exams

✅ Indian Exams:

• CA Foundation

• CUET (Quantitative Aptitude)

• CSEET

• CMA Foundation

• SSC CGL, CHSL

• RRB NTPC

• Banking (IBPS, SBI PO/Clerk, RBI Assistant)

• State PSC aptitude papers

🌍 International Exams:

• SAT Math

• ACT Math

• GRE Quant

• GMAT Quant

• IGCSE / GCSE Math

• Foundation-level Math Olympiads

💡 Quick Tip:

Remember the shortcut: Fourth Proportional = (Second × Third) ÷ First.

🧪 Try Yourself:The fourth proportional to 5, 10, 20 is...?

👉 Comment your answer below!