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Finding the Fourth Proportional to 361.78, 542.51 and 130.64

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Solution

The fourth proportional to 361.78, 542.51 and 130.64 is: 195.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.78 : 542.51 = 130.64 : x
  2. Step 2: Convert to fraction form
    361.78/542.51 = 130.64/x
  3. Step 3: Cross multiply
    361.78x = 542.51 × 130.64
  4. Step 4: Simplify right side
    361.78x = 70,874.08
  5. Step 5: Solve for x
    x = 70,874.08/361.78
  6. Step 6: Final answer
    x = 195.90

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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.