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Finding the Fourth Proportional to 424.90, 636.45 and 321.04

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Solution

The fourth proportional to 424.90, 636.45 and 321.04 is: 480.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.90 : 636.45 = 321.04 : x
  2. Step 2: Convert to fraction form
    424.90/636.45 = 321.04/x
  3. Step 3: Cross multiply
    424.90x = 636.45 × 321.04
  4. Step 4: Simplify right side
    424.90x = 204,328.30
  5. Step 5: Solve for x
    x = 204,328.30/424.90
  6. Step 6: Final answer
    x = 480.88

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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.