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Finding the Fourth Proportional to 3,679.78, 5,517.56 and 1,213.92

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Solution

The fourth proportional to 3,679.78, 5,517.56 and 1,213.92 is: 1,820.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,679.78 : 5,517.56 = 1,213.92 : x
  2. Step 2: Convert to fraction form
    3,679.78/5,517.56 = 1,213.92/x
  3. Step 3: Cross multiply
    3,679.78x = 5,517.56 × 1,213.92
  4. Step 4: Simplify right side
    3,679.78x = 6,697,876.44
  5. Step 5: Solve for x
    x = 6,697,876.44/3,679.78
  6. Step 6: Final answer
    x = 1,820.18

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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.