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Finding the Fourth Proportional to 817.29, 1,225.85 and 354.83

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Solution

The fourth proportional to 817.29, 1,225.85 and 354.83 is: 532.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.29 : 1,225.85 = 354.83 : x
  2. Step 2: Convert to fraction form
    817.29/1,225.85 = 354.83/x
  3. Step 3: Cross multiply
    817.29x = 1,225.85 × 354.83
  4. Step 4: Simplify right side
    817.29x = 434,960.45
  5. Step 5: Solve for x
    x = 434,960.45/817.29
  6. Step 6: Final answer
    x = 532.20

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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.