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Finding the Fourth Proportional to 361.72, 542.47 and 145.25

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Solution

The fourth proportional to 361.72, 542.47 and 145.25 is: 217.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.72 : 542.47 = 145.25 : x
  2. Step 2: Convert to fraction form
    361.72/542.47 = 145.25/x
  3. Step 3: Cross multiply
    361.72x = 542.47 × 145.25
  4. Step 4: Simplify right side
    361.72x = 78,793.77
  5. Step 5: Solve for x
    x = 78,793.77/361.72
  6. Step 6: Final answer
    x = 217.83

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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.