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Finding the Fourth Proportional to 26.69, 36.85 and 20.87

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Solution

The fourth proportional to 26.69, 36.85 and 20.87 is: 28.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.69 : 36.85 = 20.87 : x
  2. Step 2: Convert to fraction form
    26.69/36.85 = 20.87/x
  3. Step 3: Cross multiply
    26.69x = 36.85 × 20.87
  4. Step 4: Simplify right side
    26.69x = 768.88
  5. Step 5: Solve for x
    x = 768.88/26.69
  6. Step 6: Final answer
    x = 28.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.