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Finding the Fourth Proportional to 81,325.87, 122,061.71 and 68,081.76

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Solution

The fourth proportional to 81,325.87, 122,061.71 and 68,081.76 is: 102,183.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,325.87 : 122,061.71 = 68,081.76 : x
  2. Step 2: Convert to fraction form
    81,325.87/122,061.71 = 68,081.76/x
  3. Step 3: Cross multiply
    81,325.87x = 122,061.71 × 68,081.76
  4. Step 4: Simplify right side
    81,325.87x = 8,310,176,215.61
  5. Step 5: Solve for x
    x = 8,310,176,215.61/81,325.87
  6. Step 6: Final answer
    x = 102,183.68

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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.