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Finding the Fourth Proportional to 10,917.20, 16,375.80 and 3,521.90

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Solution

The fourth proportional to 10,917.20, 16,375.80 and 3,521.90 is: 5,282.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,917.20 : 16,375.80 = 3,521.90 : x
  2. Step 2: Convert to fraction form
    10,917.20/16,375.80 = 3,521.90/x
  3. Step 3: Cross multiply
    10,917.20x = 16,375.80 × 3,521.90
  4. Step 4: Simplify right side
    10,917.20x = 57,673,930.02
  5. Step 5: Solve for x
    x = 57,673,930.02/10,917.20
  6. Step 6: Final answer
    x = 5,282.85

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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.