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Finding the Fourth Proportional to 397.27, 548.23 and 222.61

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Solution

The fourth proportional to 397.27, 548.23 and 222.61 is: 307.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.27 : 548.23 = 222.61 : x
  2. Step 2: Convert to fraction form
    397.27/548.23 = 222.61/x
  3. Step 3: Cross multiply
    397.27x = 548.23 × 222.61
  4. Step 4: Simplify right side
    397.27x = 122,040.37
  5. Step 5: Solve for x
    x = 122,040.37/397.27
  6. Step 6: Final answer
    x = 307.20

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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.