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Finding the Fourth Proportional to 131,718.78, 197,609.46 and 42,972.30

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Solution

The fourth proportional to 131,718.78, 197,609.46 and 42,972.30 is: 64,468.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,718.78 : 197,609.46 = 42,972.30 : x
  2. Step 2: Convert to fraction form
    131,718.78/197,609.46 = 42,972.30/x
  3. Step 3: Cross multiply
    131,718.78x = 197,609.46 × 42,972.30
  4. Step 4: Simplify right side
    131,718.78x = 8,491,732,997.96
  5. Step 5: Solve for x
    x = 8,491,732,997.96/131,718.78
  6. Step 6: Final answer
    x = 64,468.66

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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.