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Finding the Fourth Proportional to 138,855.64, 191,627.76 and 81,497.44

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Solution

The fourth proportional to 138,855.64, 191,627.76 and 81,497.44 is: 112,470.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,855.64 : 191,627.76 = 81,497.44 : x
  2. Step 2: Convert to fraction form
    138,855.64/191,627.76 = 81,497.44/x
  3. Step 3: Cross multiply
    138,855.64x = 191,627.76 × 81,497.44
  4. Step 4: Simplify right side
    138,855.64x = 15,617,171,872.93
  5. Step 5: Solve for x
    x = 15,617,171,872.93/138,855.64
  6. Step 6: Final answer
    x = 112,470.56

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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.