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Finding the Fourth Proportional to 361.89, 542.90 and 118.42

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Solution

The fourth proportional to 361.89, 542.90 and 118.42 is: 177.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.89 : 542.90 = 118.42 : x
  2. Step 2: Convert to fraction form
    361.89/542.90 = 118.42/x
  3. Step 3: Cross multiply
    361.89x = 542.90 × 118.42
  4. Step 4: Simplify right side
    361.89x = 64,290.22
  5. Step 5: Solve for x
    x = 64,290.22/361.89
  6. Step 6: Final answer
    x = 177.65

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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.