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Finding the Fourth Proportional to 24.60, 36.84 and 20.85

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Solution

The fourth proportional to 24.60, 36.84 and 20.85 is: 31.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    24.60 : 36.84 = 20.85 : x
  2. Step 2: Convert to fraction form
    24.60/36.84 = 20.85/x
  3. Step 3: Cross multiply
    24.60x = 36.84 × 20.85
  4. Step 4: Simplify right side
    24.60x = 768.11
  5. Step 5: Solve for x
    x = 768.11/24.60
  6. Step 6: Final answer
    x = 31.22

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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.