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Finding the Fourth Proportional to 139,163.12, 192,046.20 and 81,787.04

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Solution

The fourth proportional to 139,163.12, 192,046.20 and 81,787.04 is: 112,866.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,163.12 : 192,046.20 = 81,787.04 : x
  2. Step 2: Convert to fraction form
    139,163.12/192,046.20 = 81,787.04/x
  3. Step 3: Cross multiply
    139,163.12x = 192,046.20 × 81,787.04
  4. Step 4: Simplify right side
    139,163.12x = 15,706,890,241.25
  5. Step 5: Solve for x
    x = 15,706,890,241.25/139,163.12
  6. Step 6: Final answer
    x = 112,866.76

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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.