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Finding the Fourth Proportional to 69.29, 103.88 and 28.69

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Solution

The fourth proportional to 69.29, 103.88 and 28.69 is: 43.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.29 : 103.88 = 28.69 : x
  2. Step 2: Convert to fraction form
    69.29/103.88 = 28.69/x
  3. Step 3: Cross multiply
    69.29x = 103.88 × 28.69
  4. Step 4: Simplify right side
    69.29x = 2,980.13
  5. Step 5: Solve for x
    x = 2,980.13/69.29
  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.