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Finding the Fourth Proportional to 397.73, 548.90 and 220.71

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Solution

The fourth proportional to 397.73, 548.90 and 220.71 is: 304.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.73 : 548.90 = 220.71 : x
  2. Step 2: Convert to fraction form
    397.73/548.90 = 220.71/x
  3. Step 3: Cross multiply
    397.73x = 548.90 × 220.71
  4. Step 4: Simplify right side
    397.73x = 121,145.38
  5. Step 5: Solve for x
    x = 121,145.38/397.73
  6. Step 6: Final answer
    x = 304.59

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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.