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Finding the Fourth Proportional to 817.62, 1,226.78 and 355.28

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Solution

The fourth proportional to 817.62, 1,226.78 and 355.28 is: 533.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.62 : 1,226.78 = 355.28 : x
  2. Step 2: Convert to fraction form
    817.62/1,226.78 = 355.28/x
  3. Step 3: Cross multiply
    817.62x = 1,226.78 × 355.28
  4. Step 4: Simplify right side
    817.62x = 435,842.49
  5. Step 5: Solve for x
    x = 435,842.49/817.62
  6. Step 6: Final answer
    x = 533.06

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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.