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Finding the Fourth Proportional to 397.44, 548.15 and 308.74

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Solution

The fourth proportional to 397.44, 548.15 and 308.74 is: 425.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.44 : 548.15 = 308.74 : x
  2. Step 2: Convert to fraction form
    397.44/548.15 = 308.74/x
  3. Step 3: Cross multiply
    397.44x = 548.15 × 308.74
  4. Step 4: Simplify right side
    397.44x = 169,235.83
  5. Step 5: Solve for x
    x = 169,235.83/397.44
  6. Step 6: Final answer
    x = 425.81

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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.