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Finding the Fourth Proportional to 3,481.40, 5,211.16 and 1,978.45

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Solution

The fourth proportional to 3,481.40, 5,211.16 and 1,978.45 is: 2,961.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,481.40 : 5,211.16 = 1,978.45 : x
  2. Step 2: Convert to fraction form
    3,481.40/5,211.16 = 1,978.45/x
  3. Step 3: Cross multiply
    3,481.40x = 5,211.16 × 1,978.45
  4. Step 4: Simplify right side
    3,481.40x = 10,310,001.53
  5. Step 5: Solve for x
    x = 10,310,001.53/3,481.40
  6. Step 6: Final answer
    x = 2,961.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.