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Finding the Fourth Proportional to 318,062.52, 477,115.68 and 81,407.28

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Solution

The fourth proportional to 318,062.52, 477,115.68 and 81,407.28 is: 122,116.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,062.52 : 477,115.68 = 81,407.28 : x
  2. Step 2: Convert to fraction form
    318,062.52/477,115.68 = 81,407.28/x
  3. Step 3: Cross multiply
    318,062.52x = 477,115.68 × 81,407.28
  4. Step 4: Simplify right side
    318,062.52x = 38,840,689,754.15
  5. Step 5: Solve for x
    x = 38,840,689,754.15/318,062.52
  6. Step 6: Final answer
    x = 122,116.53

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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.