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Finding the Fourth Proportional to 396.60, 547.22 and 309.92

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Solution

The fourth proportional to 396.60, 547.22 and 309.92 is: 427.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.60 : 547.22 = 309.92 : x
  2. Step 2: Convert to fraction form
    396.60/547.22 = 309.92/x
  3. Step 3: Cross multiply
    396.60x = 547.22 × 309.92
  4. Step 4: Simplify right side
    396.60x = 169,594.42
  5. Step 5: Solve for x
    x = 169,594.42/396.60
  6. Step 6: Final answer
    x = 427.62

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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.