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Finding the Fourth Proportional to 139,781.54, 192,891.84 and 76,118.96

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Solution

The fourth proportional to 139,781.54, 192,891.84 and 76,118.96 is: 105,040.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,781.54 : 192,891.84 = 76,118.96 : x
  2. Step 2: Convert to fraction form
    139,781.54/192,891.84 = 76,118.96/x
  3. Step 3: Cross multiply
    139,781.54x = 192,891.84 × 76,118.96
  4. Step 4: Simplify right side
    139,781.54x = 14,682,726,253.29
  5. Step 5: Solve for x
    x = 14,682,726,253.29/139,781.54
  6. Step 6: Final answer
    x = 105,040.52

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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.