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Finding the Fourth Proportional to 2,765.78, 4,149.20 and 817.91

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Solution

The fourth proportional to 2,765.78, 4,149.20 and 817.91 is: 1,227.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,765.78 : 4,149.20 = 817.91 : x
  2. Step 2: Convert to fraction form
    2,765.78/4,149.20 = 817.91/x
  3. Step 3: Cross multiply
    2,765.78x = 4,149.20 × 817.91
  4. Step 4: Simplify right side
    2,765.78x = 3,393,653.47
  5. Step 5: Solve for x
    x = 3,393,653.47/2,765.78
  6. Step 6: Final answer
    x = 1,227.02

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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.