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Finding the Fourth Proportional to 396.21, 546.15 and 313.20

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Solution

The fourth proportional to 396.21, 546.15 and 313.20 is: 431.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.21 : 546.15 = 313.20 : x
  2. Step 2: Convert to fraction form
    396.21/546.15 = 313.20/x
  3. Step 3: Cross multiply
    396.21x = 546.15 × 313.20
  4. Step 4: Simplify right side
    396.21x = 171,054.18
  5. Step 5: Solve for x
    x = 171,054.18/396.21
  6. Step 6: Final answer
    x = 431.73

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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.