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Finding the Fourth Proportional to 6,640.78, 9,957.91 and 3,868.42

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Solution

The fourth proportional to 6,640.78, 9,957.91 and 3,868.42 is: 5,800.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,640.78 : 9,957.91 = 3,868.42 : x
  2. Step 2: Convert to fraction form
    6,640.78/9,957.91 = 3,868.42/x
  3. Step 3: Cross multiply
    6,640.78x = 9,957.91 × 3,868.42
  4. Step 4: Simplify right side
    6,640.78x = 38,521,378.20
  5. Step 5: Solve for x
    x = 38,521,378.20/6,640.78
  6. Step 6: Final answer
    x = 5,800.73

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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.