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Finding the Fourth Proportional to 13.86, 20.80 and 5.85

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Solution

The fourth proportional to 13.86, 20.80 and 5.85 is: 8.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.86 : 20.80 = 5.85 : x
  2. Step 2: Convert to fraction form
    13.86/20.80 = 5.85/x
  3. Step 3: Cross multiply
    13.86x = 20.80 × 5.85
  4. Step 4: Simplify right side
    13.86x = 121.61
  5. Step 5: Solve for x
    x = 121.61/13.86
  6. Step 6: Final answer
    x = 8.78

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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.