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Finding the Fourth Proportional to 255.31, 381.11 and 224.55

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Solution

The fourth proportional to 255.31, 381.11 and 224.55 is: 335.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.31 : 381.11 = 224.55 : x
  2. Step 2: Convert to fraction form
    255.31/381.11 = 224.55/x
  3. Step 3: Cross multiply
    255.31x = 381.11 × 224.55
  4. Step 4: Simplify right side
    255.31x = 85,578.25
  5. Step 5: Solve for x
    x = 85,578.25/255.31
  6. Step 6: Final answer
    x = 335.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.