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Finding the Fourth Proportional to 86,608.20, 129,815.10 and 36,679.80

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Solution

The fourth proportional to 86,608.20, 129,815.10 and 36,679.80 is: 54,978.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,608.20 : 129,815.10 = 36,679.80 : x
  2. Step 2: Convert to fraction form
    86,608.20/129,815.10 = 36,679.80/x
  3. Step 3: Cross multiply
    86,608.20x = 129,815.10 × 36,679.80
  4. Step 4: Simplify right side
    86,608.20x = 4,761,591,904.98
  5. Step 5: Solve for x
    x = 4,761,591,904.98/86,608.20
  6. Step 6: Final answer
    x = 54,978.53

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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.