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Finding the Fourth Proportional to 139,422.41, 192,387.31 and 78,980.11

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Solution

The fourth proportional to 139,422.41, 192,387.31 and 78,980.11 is: 108,983.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,422.41 : 192,387.31 = 78,980.11 : x
  2. Step 2: Convert to fraction form
    139,422.41/192,387.31 = 78,980.11/x
  3. Step 3: Cross multiply
    139,422.41x = 192,387.31 × 78,980.11
  4. Step 4: Simplify right side
    139,422.41x = 15,194,770,227.99
  5. Step 5: Solve for x
    x = 15,194,770,227.99/139,422.41
  6. Step 6: Final answer
    x = 108,983.70

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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.