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Finding the Fourth Proportional to 81,431.70, 122,147.55 and 67,434.90

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Solution

The fourth proportional to 81,431.70, 122,147.55 and 67,434.90 is: 101,152.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,431.70 : 122,147.55 = 67,434.90 : x
  2. Step 2: Convert to fraction form
    81,431.70/122,147.55 = 67,434.90/x
  3. Step 3: Cross multiply
    81,431.70x = 122,147.55 × 67,434.90
  4. Step 4: Simplify right side
    81,431.70x = 8,237,007,819.50
  5. Step 5: Solve for x
    x = 8,237,007,819.50/81,431.70
  6. Step 6: Final answer
    x = 101,152.35

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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.