Home / 81,688.73-122,540.64-31,772.61

Finding the Fourth Proportional to 81,688.73, 122,540.64 and 31,772.61

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Solution

The fourth proportional to 81,688.73, 122,540.64 and 31,772.61 is: 47,661.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,688.73 : 122,540.64 = 31,772.61 : x
  2. Step 2: Convert to fraction form
    81,688.73/122,540.64 = 31,772.61/x
  3. Step 3: Cross multiply
    81,688.73x = 122,540.64 × 31,772.61
  4. Step 4: Simplify right side
    81,688.73x = 3,893,435,963.87
  5. Step 5: Solve for x
    x = 3,893,435,963.87/81,688.73
  6. Step 6: Final answer
    x = 47,661.85

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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.