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Finding the Fourth Proportional to 69.67, 103.92 and 68.79

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Solution

The fourth proportional to 69.67, 103.92 and 68.79 is: 102.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.67 : 103.92 = 68.79 : x
  2. Step 2: Convert to fraction form
    69.67/103.92 = 68.79/x
  3. Step 3: Cross multiply
    69.67x = 103.92 × 68.79
  4. Step 4: Simplify right side
    69.67x = 7,148.66
  5. Step 5: Solve for x
    x = 7,148.66/69.67
  6. Step 6: Final answer
    x = 102.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.