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Finding the Fourth Proportional to 129,292.78, 178,422.87 and 72,704.56

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Solution

The fourth proportional to 129,292.78, 178,422.87 and 72,704.56 is: 100,331.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,292.78 : 178,422.87 = 72,704.56 : x
  2. Step 2: Convert to fraction form
    129,292.78/178,422.87 = 72,704.56/x
  3. Step 3: Cross multiply
    129,292.78x = 178,422.87 × 72,704.56
  4. Step 4: Simplify right side
    129,292.78x = 12,972,156,257.29
  5. Step 5: Solve for x
    x = 12,972,156,257.29/129,292.78
  6. Step 6: Final answer
    x = 100,331.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.