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Finding the Fourth Proportional to 3,893.76, 5,372.64 and 2,321.28

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Solution

The fourth proportional to 3,893.76, 5,372.64 and 2,321.28 is: 3,202.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,893.76 : 5,372.64 = 2,321.28 : x
  2. Step 2: Convert to fraction form
    3,893.76/5,372.64 = 2,321.28/x
  3. Step 3: Cross multiply
    3,893.76x = 5,372.64 × 2,321.28
  4. Step 4: Simplify right side
    3,893.76x = 12,471,401.78
  5. Step 5: Solve for x
    x = 12,471,401.78/3,893.76
  6. Step 6: Final answer
    x = 3,202.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.