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Finding the Fourth Proportional to 396.66, 547.64 and 256.84

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Solution

The fourth proportional to 396.66, 547.64 and 256.84 is: 354.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.66 : 547.64 = 256.84 : x
  2. Step 2: Convert to fraction form
    396.66/547.64 = 256.84/x
  3. Step 3: Cross multiply
    396.66x = 547.64 × 256.84
  4. Step 4: Simplify right side
    396.66x = 140,655.86
  5. Step 5: Solve for x
    x = 140,655.86/396.66
  6. Step 6: Final answer
    x = 354.60

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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.