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Finding the Fourth Proportional to 139,654.13, 192,721.07 and 75,990.83

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Solution

The fourth proportional to 139,654.13, 192,721.07 and 75,990.83 is: 104,866.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,654.13 : 192,721.07 = 75,990.83 : x
  2. Step 2: Convert to fraction form
    139,654.13/192,721.07 = 75,990.83/x
  3. Step 3: Cross multiply
    139,654.13x = 192,721.07 × 75,990.83
  4. Step 4: Simplify right side
    139,654.13x = 14,645,033,294.16
  5. Step 5: Solve for x
    x = 14,645,033,294.16/139,654.13
  6. Step 6: Final answer
    x = 104,866.46

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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.