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Finding the Fourth Proportional to 396.70, 546.35 and 331.09

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Solution

The fourth proportional to 396.70, 546.35 and 331.09 is: 455.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.70 : 546.35 = 331.09 : x
  2. Step 2: Convert to fraction form
    396.70/546.35 = 331.09/x
  3. Step 3: Cross multiply
    396.70x = 546.35 × 331.09
  4. Step 4: Simplify right side
    396.70x = 180,888.00
  5. Step 5: Solve for x
    x = 180,888.00/396.70
  6. Step 6: Final answer
    x = 455.98

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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.