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Finding the Fourth Proportional to 8,920.78, 13,381.28 and 4,241.28

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Solution

The fourth proportional to 8,920.78, 13,381.28 and 4,241.28 is: 6,361.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.78 : 13,381.28 = 4,241.28 : x
  2. Step 2: Convert to fraction form
    8,920.78/13,381.28 = 4,241.28/x
  3. Step 3: Cross multiply
    8,920.78x = 13,381.28 × 4,241.28
  4. Step 4: Simplify right side
    8,920.78x = 56,753,755.24
  5. Step 5: Solve for x
    x = 56,753,755.24/8,920.78
  6. Step 6: Final answer
    x = 6,361.97

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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.