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Finding the Fourth Proportional to 139,398.83, 192,379.87 and 78,969.95

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Solution

The fourth proportional to 139,398.83, 192,379.87 and 78,969.95 is: 108,983.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,398.83 : 192,379.87 = 78,969.95 : x
  2. Step 2: Convert to fraction form
    139,398.83/192,379.87 = 78,969.95/x
  3. Step 3: Cross multiply
    139,398.83x = 192,379.87 × 78,969.95
  4. Step 4: Simplify right side
    139,398.83x = 15,192,228,714.91
  5. Step 5: Solve for x
    x = 15,192,228,714.91/139,398.83
  6. Step 6: Final answer
    x = 108,983.90

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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.