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Finding the Fourth Proportional to 542.21, 748.05 and 355.81

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Solution

The fourth proportional to 542.21, 748.05 and 355.81 is: 490.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.21 : 748.05 = 355.81 : x
  2. Step 2: Convert to fraction form
    542.21/748.05 = 355.81/x
  3. Step 3: Cross multiply
    542.21x = 748.05 × 355.81
  4. Step 4: Simplify right side
    542.21x = 266,161.75
  5. Step 5: Solve for x
    x = 266,161.75/542.21
  6. Step 6: Final answer
    x = 490.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.