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Finding the Fourth Proportional to 81,811.89, 122,585.76 and 68,689.89

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Solution

The fourth proportional to 81,811.89, 122,585.76 and 68,689.89 is: 102,923.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,811.89 : 122,585.76 = 68,689.89 : x
  2. Step 2: Convert to fraction form
    81,811.89/122,585.76 = 68,689.89/x
  3. Step 3: Cross multiply
    81,811.89x = 122,585.76 × 68,689.89
  4. Step 4: Simplify right side
    81,811.89x = 8,420,402,369.97
  5. Step 5: Solve for x
    x = 8,420,402,369.97/81,811.89
  6. Step 6: Final answer
    x = 102,923.94

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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.