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Finding the Fourth Proportional to 382.40, 572.24 and 331.22

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Solution

The fourth proportional to 382.40, 572.24 and 331.22 is: 495.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.40 : 572.24 = 331.22 : x
  2. Step 2: Convert to fraction form
    382.40/572.24 = 331.22/x
  3. Step 3: Cross multiply
    382.40x = 572.24 × 331.22
  4. Step 4: Simplify right side
    382.40x = 189,535.68
  5. Step 5: Solve for x
    x = 189,535.68/382.40
  6. Step 6: Final answer
    x = 495.64

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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.