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Finding the Fourth Proportional to 125,990.20, 188,726.10 and 86,591.80

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Solution

The fourth proportional to 125,990.20, 188,726.10 and 86,591.80 is: 129,709.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,990.20 : 188,726.10 = 86,591.80 : x
  2. Step 2: Convert to fraction form
    125,990.20/188,726.10 = 86,591.80/x
  3. Step 3: Cross multiply
    125,990.20x = 188,726.10 × 86,591.80
  4. Step 4: Simplify right side
    125,990.20x = 16,342,132,705.98
  5. Step 5: Solve for x
    x = 16,342,132,705.98/125,990.20
  6. Step 6: Final answer
    x = 129,709.55

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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.