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Finding the Fourth Proportional to 817.75, 1,226.78 and 270.31

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Solution

The fourth proportional to 817.75, 1,226.78 and 270.31 is: 405.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.75 : 1,226.78 = 270.31 : x
  2. Step 2: Convert to fraction form
    817.75/1,226.78 = 270.31/x
  3. Step 3: Cross multiply
    817.75x = 1,226.78 × 270.31
  4. Step 4: Simplify right side
    817.75x = 331,610.90
  5. Step 5: Solve for x
    x = 331,610.90/817.75
  6. Step 6: Final answer
    x = 405.52

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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.