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Finding the Fourth Proportional to 69.64, 103.92 and 61.97

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Solution

The fourth proportional to 69.64, 103.92 and 61.97 is: 92.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.64 : 103.92 = 61.97 : x
  2. Step 2: Convert to fraction form
    69.64/103.92 = 61.97/x
  3. Step 3: Cross multiply
    69.64x = 103.92 × 61.97
  4. Step 4: Simplify right side
    69.64x = 6,440.57
  5. Step 5: Solve for x
    x = 6,440.57/69.64
  6. Step 6: Final answer
    x = 92.48

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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.