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Finding the Fourth Proportional to 817.10, 1,225.92 and 329.90

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Solution

The fourth proportional to 817.10, 1,225.92 and 329.90 is: 494.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.10 : 1,225.92 = 329.90 : x
  2. Step 2: Convert to fraction form
    817.10/1,225.92 = 329.90/x
  3. Step 3: Cross multiply
    817.10x = 1,225.92 × 329.90
  4. Step 4: Simplify right side
    817.10x = 404,431.01
  5. Step 5: Solve for x
    x = 404,431.01/817.10
  6. Step 6: Final answer
    x = 494.96

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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.