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Finding the Fourth Proportional to 86,115.41, 129,103.40 and 26,920.61

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Solution

The fourth proportional to 86,115.41, 129,103.40 and 26,920.61 is: 40,359.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,115.41 : 129,103.40 = 26,920.61 : x
  2. Step 2: Convert to fraction form
    86,115.41/129,103.40 = 26,920.61/x
  3. Step 3: Cross multiply
    86,115.41x = 129,103.40 × 26,920.61
  4. Step 4: Simplify right side
    86,115.41x = 3,475,541,702.86
  5. Step 5: Solve for x
    x = 3,475,541,702.86/86,115.41
  6. Step 6: Final answer
    x = 40,359.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.