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Finding the Fourth Proportional to 397.32, 548.15 and 231.47

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Solution

The fourth proportional to 397.32, 548.15 and 231.47 is: 319.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.32 : 548.15 = 231.47 : x
  2. Step 2: Convert to fraction form
    397.32/548.15 = 231.47/x
  3. Step 3: Cross multiply
    397.32x = 548.15 × 231.47
  4. Step 4: Simplify right side
    397.32x = 126,880.28
  5. Step 5: Solve for x
    x = 126,880.28/397.32
  6. Step 6: Final answer
    x = 319.34

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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.