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Finding the Fourth Proportional to 139,438.11, 192,425.82 and 75,775.92

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Solution

The fourth proportional to 139,438.11, 192,425.82 and 75,775.92 is: 104,571.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,438.11 : 192,425.82 = 75,775.92 : x
  2. Step 2: Convert to fraction form
    139,438.11/192,425.82 = 75,775.92/x
  3. Step 3: Cross multiply
    139,438.11x = 192,425.82 × 75,775.92
  4. Step 4: Simplify right side
    139,438.11x = 14,581,243,542.25
  5. Step 5: Solve for x
    x = 14,581,243,542.25/139,438.11
  6. Step 6: Final answer
    x = 104,571.44

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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.