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Finding the Fourth Proportional to 396.77, 548.21 and 352.72

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Solution

The fourth proportional to 396.77, 548.21 and 352.72 is: 487.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.77 : 548.21 = 352.72 : x
  2. Step 2: Convert to fraction form
    396.77/548.21 = 352.72/x
  3. Step 3: Cross multiply
    396.77x = 548.21 × 352.72
  4. Step 4: Simplify right side
    396.77x = 193,360.13
  5. Step 5: Solve for x
    x = 193,360.13/396.77
  6. Step 6: Final answer
    x = 487.34

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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.