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Finding the Fourth Proportional to 139,321.68, 192,253.26 and 81,963.28

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Solution

The fourth proportional to 139,321.68, 192,253.26 and 81,963.28 is: 113,103.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,321.68 : 192,253.26 = 81,963.28 : x
  2. Step 2: Convert to fraction form
    139,321.68/192,253.26 = 81,963.28/x
  3. Step 3: Cross multiply
    139,321.68x = 192,253.26 × 81,963.28
  4. Step 4: Simplify right side
    139,321.68x = 15,757,707,780.29
  5. Step 5: Solve for x
    x = 15,757,707,780.29/139,321.68
  6. Step 6: Final answer
    x = 113,103.06

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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.