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Finding the Fourth Proportional to 81,620.76, 122,387.66 and 28,299.17

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Solution

The fourth proportional to 81,620.76, 122,387.66 and 28,299.17 is: 42,433.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,620.76 : 122,387.66 = 28,299.17 : x
  2. Step 2: Convert to fraction form
    81,620.76/122,387.66 = 28,299.17/x
  3. Step 3: Cross multiply
    81,620.76x = 122,387.66 × 28,299.17
  4. Step 4: Simplify right side
    81,620.76x = 3,463,469,466.84
  5. Step 5: Solve for x
    x = 3,463,469,466.84/81,620.76
  6. Step 6: Final answer
    x = 42,433.68

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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.