Home / 81,691.73-122,545.14-31,775.61

Finding the Fourth Proportional to 81,691.73, 122,545.14 and 31,775.61

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Solution

The fourth proportional to 81,691.73, 122,545.14 and 31,775.61 is: 47,666.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,691.73 : 122,545.14 = 31,775.61 : x
  2. Step 2: Convert to fraction form
    81,691.73/122,545.14 = 31,775.61/x
  3. Step 3: Cross multiply
    81,691.73x = 122,545.14 × 31,775.61
  4. Step 4: Simplify right side
    81,691.73x = 3,893,946,576.04
  5. Step 5: Solve for x
    x = 3,893,946,576.04/81,691.73
  6. Step 6: Final answer
    x = 47,666.35

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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.