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Finding the Fourth Proportional to 396.36, 547.10 and 318.22

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Solution

The fourth proportional to 396.36, 547.10 and 318.22 is: 439.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.36 : 547.10 = 318.22 : x
  2. Step 2: Convert to fraction form
    396.36/547.10 = 318.22/x
  3. Step 3: Cross multiply
    396.36x = 547.10 × 318.22
  4. Step 4: Simplify right side
    396.36x = 174,098.16
  5. Step 5: Solve for x
    x = 174,098.16/396.36
  6. Step 6: Final answer
    x = 439.24

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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.