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Finding the Fourth Proportional to 402.38, 602.94 and 321.20

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Solution

The fourth proportional to 402.38, 602.94 and 321.20 is: 481.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.38 : 602.94 = 321.20 : x
  2. Step 2: Convert to fraction form
    402.38/602.94 = 321.20/x
  3. Step 3: Cross multiply
    402.38x = 602.94 × 321.20
  4. Step 4: Simplify right side
    402.38x = 193,661.62
  5. Step 5: Solve for x
    x = 193,661.62/402.38
  6. Step 6: Final answer
    x = 481.29

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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.