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Finding the Fourth Proportional to 397.04, 547.80 and 231.20

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Solution

The fourth proportional to 397.04, 547.80 and 231.20 is: 318.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.04 : 547.80 = 231.20 : x
  2. Step 2: Convert to fraction form
    397.04/547.80 = 231.20/x
  3. Step 3: Cross multiply
    397.04x = 547.80 × 231.20
  4. Step 4: Simplify right side
    397.04x = 126,648.62
  5. Step 5: Solve for x
    x = 126,648.62/397.04
  6. Step 6: Final answer
    x = 318.99

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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.