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Finding the Fourth Proportional to 396.78, 595.16 and 214.53

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Solution

The fourth proportional to 396.78, 595.16 and 214.53 is: 321.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.78 : 595.16 = 214.53 : x
  2. Step 2: Convert to fraction form
    396.78/595.16 = 214.53/x
  3. Step 3: Cross multiply
    396.78x = 595.16 × 214.53
  4. Step 4: Simplify right side
    396.78x = 127,678.60
  5. Step 5: Solve for x
    x = 127,678.60/396.78
  6. Step 6: Final answer
    x = 321.79

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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.