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Finding the Fourth Proportional to 401.31, 553.42 and 243.97

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Solution

The fourth proportional to 401.31, 553.42 and 243.97 is: 336.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.31 : 553.42 = 243.97 : x
  2. Step 2: Convert to fraction form
    401.31/553.42 = 243.97/x
  3. Step 3: Cross multiply
    401.31x = 553.42 × 243.97
  4. Step 4: Simplify right side
    401.31x = 135,013.89
  5. Step 5: Solve for x
    x = 135,013.89/401.31
  6. Step 6: Final answer
    x = 336.43

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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.