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Finding the Fourth Proportional to 397.11, 547.86 and 231.30

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Solution

The fourth proportional to 397.11, 547.86 and 231.30 is: 319.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.11 : 547.86 = 231.30 : x
  2. Step 2: Convert to fraction form
    397.11/547.86 = 231.30/x
  3. Step 3: Cross multiply
    397.11x = 547.86 × 231.30
  4. Step 4: Simplify right side
    397.11x = 126,720.02
  5. Step 5: Solve for x
    x = 126,720.02/397.11
  6. Step 6: Final answer
    x = 319.11

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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.