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Finding the Fourth Proportional to 397.41, 548.45 and 222.78

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Solution

The fourth proportional to 397.41, 548.45 and 222.78 is: 307.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.41 : 548.45 = 222.78 : x
  2. Step 2: Convert to fraction form
    397.41/548.45 = 222.78/x
  3. Step 3: Cross multiply
    397.41x = 548.45 × 222.78
  4. Step 4: Simplify right side
    397.41x = 122,186.72
  5. Step 5: Solve for x
    x = 122,186.72/397.41
  6. Step 6: Final answer
    x = 307.46

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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.