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Finding the Fourth Proportional to 81,620.88, 122,419.08 and 38,915.52

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Solution

The fourth proportional to 81,620.88, 122,419.08 and 38,915.52 is: 58,367.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,620.88 : 122,419.08 = 38,915.52 : x
  2. Step 2: Convert to fraction form
    81,620.88/122,419.08 = 38,915.52/x
  3. Step 3: Cross multiply
    81,620.88x = 122,419.08 × 38,915.52
  4. Step 4: Simplify right side
    81,620.88x = 4,764,002,156.12
  5. Step 5: Solve for x
    x = 4,764,002,156.12/81,620.88
  6. Step 6: Final answer
    x = 58,367.44

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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.