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Finding the Fourth Proportional to 2,765.90, 4,149.24 and 817.84

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Solution

The fourth proportional to 2,765.90, 4,149.24 and 817.84 is: 1,226.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,765.90 : 4,149.24 = 817.84 : x
  2. Step 2: Convert to fraction form
    2,765.90/4,149.24 = 817.84/x
  3. Step 3: Cross multiply
    2,765.90x = 4,149.24 × 817.84
  4. Step 4: Simplify right side
    2,765.90x = 3,393,414.44
  5. Step 5: Solve for x
    x = 3,393,414.44/2,765.90
  6. Step 6: Final answer
    x = 1,226.88

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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.