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Finding the Fourth Proportional to 69.50, 104.28 and 26.78

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Solution

The fourth proportional to 69.50, 104.28 and 26.78 is: 40.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.50 : 104.28 = 26.78 : x
  2. Step 2: Convert to fraction form
    69.50/104.28 = 26.78/x
  3. Step 3: Cross multiply
    69.50x = 104.28 × 26.78
  4. Step 4: Simplify right side
    69.50x = 2,792.62
  5. Step 5: Solve for x
    x = 2,792.62/69.50
  6. Step 6: Final answer
    x = 40.18

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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.