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Finding the Fourth Proportional to 361.40, 542.41 and 145.13

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Solution

The fourth proportional to 361.40, 542.41 and 145.13 is: 217.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.40 : 542.41 = 145.13 : x
  2. Step 2: Convert to fraction form
    361.40/542.41 = 145.13/x
  3. Step 3: Cross multiply
    361.40x = 542.41 × 145.13
  4. Step 4: Simplify right side
    361.40x = 78,720.96
  5. Step 5: Solve for x
    x = 78,720.96/361.40
  6. Step 6: Final answer
    x = 217.82

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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.