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Finding the Fourth Proportional to 10,919.20, 16,375.20 and 3,992.80

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Solution

The fourth proportional to 10,919.20, 16,375.20 and 3,992.80 is: 5,987.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,919.20 : 16,375.20 = 3,992.80 : x
  2. Step 2: Convert to fraction form
    10,919.20/16,375.20 = 3,992.80/x
  3. Step 3: Cross multiply
    10,919.20x = 16,375.20 × 3,992.80
  4. Step 4: Simplify right side
    10,919.20x = 65,382,898.56
  5. Step 5: Solve for x
    x = 65,382,898.56/10,919.20
  6. Step 6: Final answer
    x = 5,987.88

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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.