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Finding the Fourth Proportional to 29,910.92, 40,978.11 and 28,789.88

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Solution

The fourth proportional to 29,910.92, 40,978.11 and 28,789.88 is: 39,442.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,910.92 : 40,978.11 = 28,789.88 : x
  2. Step 2: Convert to fraction form
    29,910.92/40,978.11 = 28,789.88/x
  3. Step 3: Cross multiply
    29,910.92x = 40,978.11 × 28,789.88
  4. Step 4: Simplify right side
    29,910.92x = 1,179,754,869.53
  5. Step 5: Solve for x
    x = 1,179,754,869.53/29,910.92
  6. Step 6: Final answer
    x = 39,442.28

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.