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Finding the Fourth Proportional to 9,921.80, 14,891.10 and 4,082.60

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Solution

The fourth proportional to 9,921.80, 14,891.10 and 4,082.60 is: 6,127.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,921.80 : 14,891.10 = 4,082.60 : x
  2. Step 2: Convert to fraction form
    9,921.80/14,891.10 = 4,082.60/x
  3. Step 3: Cross multiply
    9,921.80x = 14,891.10 × 4,082.60
  4. Step 4: Simplify right side
    9,921.80x = 60,794,404.86
  5. Step 5: Solve for x
    x = 60,794,404.86/9,921.80
  6. Step 6: Final answer
    x = 6,127.36

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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.