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Finding the Fourth Proportional to 81.31, 121.97 and 23.54

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Solution

The fourth proportional to 81.31, 121.97 and 23.54 is: 35.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.31 : 121.97 = 23.54 : x
  2. Step 2: Convert to fraction form
    81.31/121.97 = 23.54/x
  3. Step 3: Cross multiply
    81.31x = 121.97 × 23.54
  4. Step 4: Simplify right side
    81.31x = 2,871.17
  5. Step 5: Solve for x
    x = 2,871.17/81.31
  6. Step 6: Final answer
    x = 35.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.