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Finding the Fourth Proportional to 139,344.82, 192,289.41 and 78,915.90

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Solution

The fourth proportional to 139,344.82, 192,289.41 and 78,915.90 is: 108,900.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,344.82 : 192,289.41 = 78,915.90 : x
  2. Step 2: Convert to fraction form
    139,344.82/192,289.41 = 78,915.90/x
  3. Step 3: Cross multiply
    139,344.82x = 192,289.41 × 78,915.90
  4. Step 4: Simplify right side
    139,344.82x = 15,174,691,194.14
  5. Step 5: Solve for x
    x = 15,174,691,194.14/139,344.82
  6. Step 6: Final answer
    x = 108,900.29

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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.