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Finding the Fourth Proportional to 139,839.49, 192,992.43 and 85,388.65

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Solution

The fourth proportional to 139,839.49, 192,992.43 and 85,388.65 is: 117,844.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,839.49 : 192,992.43 = 85,388.65 : x
  2. Step 2: Convert to fraction form
    139,839.49/192,992.43 = 85,388.65/x
  3. Step 3: Cross multiply
    139,839.49x = 192,992.43 × 85,388.65
  4. Step 4: Simplify right side
    139,839.49x = 16,479,363,057.92
  5. Step 5: Solve for x
    x = 16,479,363,057.92/139,839.49
  6. Step 6: Final answer
    x = 117,844.85

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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.