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Finding the Fourth Proportional to 139,387.53, 192,348.61 and 78,956.96

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Solution

The fourth proportional to 139,387.53, 192,348.61 and 78,956.96 is: 108,957.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,387.53 : 192,348.61 = 78,956.96 : x
  2. Step 2: Convert to fraction form
    139,387.53/192,348.61 = 78,956.96/x
  3. Step 3: Cross multiply
    139,387.53x = 192,348.61 × 78,956.96
  4. Step 4: Simplify right side
    139,387.53x = 15,187,261,428.65
  5. Step 5: Solve for x
    x = 15,187,261,428.65/139,387.53
  6. Step 6: Final answer
    x = 108,957.10

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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.