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Finding the Fourth Proportional to 396.51, 547.40 and 239.17

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Solution

The fourth proportional to 396.51, 547.40 and 239.17 is: 330.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.51 : 547.40 = 239.17 : x
  2. Step 2: Convert to fraction form
    396.51/547.40 = 239.17/x
  3. Step 3: Cross multiply
    396.51x = 547.40 × 239.17
  4. Step 4: Simplify right side
    396.51x = 130,921.66
  5. Step 5: Solve for x
    x = 130,921.66/396.51
  6. Step 6: Final answer
    x = 330.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.