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Finding the Fourth Proportional to 396.90, 595.45 and 285.85

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Solution

The fourth proportional to 396.90, 595.45 and 285.85 is: 428.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.90 : 595.45 = 285.85 : x
  2. Step 2: Convert to fraction form
    396.90/595.45 = 285.85/x
  3. Step 3: Cross multiply
    396.90x = 595.45 × 285.85
  4. Step 4: Simplify right side
    396.90x = 170,206.41
  5. Step 5: Solve for x
    x = 170,206.41/396.90
  6. Step 6: Final answer
    x = 428.84

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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.