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Finding the Fourth Proportional to 817.10, 1,225.20 and 329.60

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Solution

The fourth proportional to 817.10, 1,225.20 and 329.60 is: 494.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.10 : 1,225.20 = 329.60 : x
  2. Step 2: Convert to fraction form
    817.10/1,225.20 = 329.60/x
  3. Step 3: Cross multiply
    817.10x = 1,225.20 × 329.60
  4. Step 4: Simplify right side
    817.10x = 403,825.92
  5. Step 5: Solve for x
    x = 403,825.92/817.10
  6. Step 6: Final answer
    x = 494.22

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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.