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Finding the Fourth Proportional to 139,654.53, 192,724.92 and 75,990.96

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Solution

The fourth proportional to 139,654.53, 192,724.92 and 75,990.96 is: 104,868.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,654.53 : 192,724.92 = 75,990.96 : x
  2. Step 2: Convert to fraction form
    139,654.53/192,724.92 = 75,990.96/x
  3. Step 3: Cross multiply
    139,654.53x = 192,724.92 × 75,990.96
  4. Step 4: Simplify right side
    139,654.53x = 14,645,351,686.72
  5. Step 5: Solve for x
    x = 14,645,351,686.72/139,654.53
  6. Step 6: Final answer
    x = 104,868.43

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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.