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Finding the Fourth Proportional to 139,385.49, 192,351.83 and 75,722.87

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Solution

The fourth proportional to 139,385.49, 192,351.83 and 75,722.87 is: 104,497.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,385.49 : 192,351.83 = 75,722.87 : x
  2. Step 2: Convert to fraction form
    139,385.49/192,351.83 = 75,722.87/x
  3. Step 3: Cross multiply
    139,385.49x = 192,351.83 × 75,722.87
  4. Step 4: Simplify right side
    139,385.49x = 14,565,431,276.98
  5. Step 5: Solve for x
    x = 14,565,431,276.98/139,385.49
  6. Step 6: Final answer
    x = 104,497.47

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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.