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Finding the Fourth Proportional to 23.82, 35.86 and 20.85

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Solution

The fourth proportional to 23.82, 35.86 and 20.85 is: 31.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.82 : 35.86 = 20.85 : x
  2. Step 2: Convert to fraction form
    23.82/35.86 = 20.85/x
  3. Step 3: Cross multiply
    23.82x = 35.86 × 20.85
  4. Step 4: Simplify right side
    23.82x = 747.68
  5. Step 5: Solve for x
    x = 747.68/23.82
  6. Step 6: Final answer
    x = 31.39

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.