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Finding the Fourth Proportional to 81,737.10, 122,610.51 and 31,800.60

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Solution

The fourth proportional to 81,737.10, 122,610.51 and 31,800.60 is: 47,702.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,737.10 : 122,610.51 = 31,800.60 : x
  2. Step 2: Convert to fraction form
    81,737.10/122,610.51 = 31,800.60/x
  3. Step 3: Cross multiply
    81,737.10x = 122,610.51 × 31,800.60
  4. Step 4: Simplify right side
    81,737.10x = 3,899,087,784.31
  5. Step 5: Solve for x
    x = 3,899,087,784.31/81,737.10
  6. Step 6: Final answer
    x = 47,702.79

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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.