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Finding the Fourth Proportional to 817.71, 1,226.24 and 355.40

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Solution

The fourth proportional to 817.71, 1,226.24 and 355.40 is: 532.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.71 : 1,226.24 = 355.40 : x
  2. Step 2: Convert to fraction form
    817.71/1,226.24 = 355.40/x
  3. Step 3: Cross multiply
    817.71x = 1,226.24 × 355.40
  4. Step 4: Simplify right side
    817.71x = 435,805.70
  5. Step 5: Solve for x
    x = 435,805.70/817.71
  6. Step 6: Final answer
    x = 532.96

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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.