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Finding the Fourth Proportional to 69.26, 103.91 and 28.67

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Solution

The fourth proportional to 69.26, 103.91 and 28.67 is: 43.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.26 : 103.91 = 28.67 : x
  2. Step 2: Convert to fraction form
    69.26/103.91 = 28.67/x
  3. Step 3: Cross multiply
    69.26x = 103.91 × 28.67
  4. Step 4: Simplify right side
    69.26x = 2,978.44
  5. Step 5: Solve for x
    x = 2,978.44/69.26
  6. Step 6: Final answer
    x = 43.01

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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.