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Finding the Fourth Proportional to 817.31, 1,226.09 and 355.21

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Solution

The fourth proportional to 817.31, 1,226.09 and 355.21 is: 532.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.31 : 1,226.09 = 355.21 : x
  2. Step 2: Convert to fraction form
    817.31/1,226.09 = 355.21/x
  3. Step 3: Cross multiply
    817.31x = 1,226.09 × 355.21
  4. Step 4: Simplify right side
    817.31x = 435,519.43
  5. Step 5: Solve for x
    x = 435,519.43/817.31
  6. Step 6: Final answer
    x = 532.87

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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.