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Finding the Fourth Proportional to 361.97, 542.40 and 217.79

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Solution

The fourth proportional to 361.97, 542.40 and 217.79 is: 326.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.97 : 542.40 = 217.79 : x
  2. Step 2: Convert to fraction form
    361.97/542.40 = 217.79/x
  3. Step 3: Cross multiply
    361.97x = 542.40 × 217.79
  4. Step 4: Simplify right side
    361.97x = 118,126.58
  5. Step 5: Solve for x
    x = 118,126.58/361.97
  6. Step 6: Final answer
    x = 326.35

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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.