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Finding the Fourth Proportional to 69.20, 103.02 and 68.80

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Solution

The fourth proportional to 69.20, 103.02 and 68.80 is: 102.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.20 : 103.02 = 68.80 : x
  2. Step 2: Convert to fraction form
    69.20/103.02 = 68.80/x
  3. Step 3: Cross multiply
    69.20x = 103.02 × 68.80
  4. Step 4: Simplify right side
    69.20x = 7,087.78
  5. Step 5: Solve for x
    x = 7,087.78/69.20
  6. Step 6: Final answer
    x = 102.42

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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.