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Finding the Fourth Proportional to 397.10, 548 and 231.41

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Solution

The fourth proportional to 397.10, 548 and 231.41 is: 319.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.10 : 548 = 231.41 : x
  2. Step 2: Convert to fraction form
    397.10/548 = 231.41/x
  3. Step 3: Cross multiply
    397.10x = 548 × 231.41
  4. Step 4: Simplify right side
    397.10x = 126,812.68
  5. Step 5: Solve for x
    x = 126,812.68/397.10
  6. Step 6: Final answer
    x = 319.35

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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.