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Finding the Fourth Proportional to 128,515.98, 192,759.32 and 81,276.78

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Solution

The fourth proportional to 128,515.98, 192,759.32 and 81,276.78 is: 121,905.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,515.98 : 192,759.32 = 81,276.78 : x
  2. Step 2: Convert to fraction form
    128,515.98/192,759.32 = 81,276.78/x
  3. Step 3: Cross multiply
    128,515.98x = 192,759.32 × 81,276.78
  4. Step 4: Simplify right side
    128,515.98x = 15,666,856,438.21
  5. Step 5: Solve for x
    x = 15,666,856,438.21/128,515.98
  6. Step 6: Final answer
    x = 121,905.90

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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.