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Finding the Fourth Proportional to 81, 111.96 and 69.36

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Solution

The fourth proportional to 81, 111.96 and 69.36 is: 95.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    81 : 111.96 = 69.36 : x
  2. Step 2: Convert to fraction form
    81/111.96 = 69.36/x
  3. Step 3: Cross multiply
    81x = 111.96 × 69.36
  4. Step 4: Simplify right side
    81x = 7,765.55
  5. Step 5: Solve for x
    x = 7,765.55/81
  6. Step 6: Final answer
    x = 95.87

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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.