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Finding the Fourth Proportional to 81,490.88, 122,238.88 and 25,331.28

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Solution

The fourth proportional to 81,490.88, 122,238.88 and 25,331.28 is: 37,997.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,490.88 : 122,238.88 = 25,331.28 : x
  2. Step 2: Convert to fraction form
    81,490.88/122,238.88 = 25,331.28/x
  3. Step 3: Cross multiply
    81,490.88x = 122,238.88 × 25,331.28
  4. Step 4: Simplify right side
    81,490.88x = 3,096,467,296.17
  5. Step 5: Solve for x
    x = 3,096,467,296.17/81,490.88
  6. Step 6: Final answer
    x = 37,997.72

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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.