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Finding the Fourth Proportional to 397.73, 548.87 and 220.70

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Solution

The fourth proportional to 397.73, 548.87 and 220.70 is: 304.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.73 : 548.87 = 220.70 : x
  2. Step 2: Convert to fraction form
    397.73/548.87 = 220.70/x
  3. Step 3: Cross multiply
    397.73x = 548.87 × 220.70
  4. Step 4: Simplify right side
    397.73x = 121,135.61
  5. Step 5: Solve for x
    x = 121,135.61/397.73
  6. Step 6: Final answer
    x = 304.57

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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.