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Finding the Fourth Proportional to 20.82, 28.60 and 18.08

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Solution

The fourth proportional to 20.82, 28.60 and 18.08 is: 24.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.82 : 28.60 = 18.08 : x
  2. Step 2: Convert to fraction form
    20.82/28.60 = 18.08/x
  3. Step 3: Cross multiply
    20.82x = 28.60 × 18.08
  4. Step 4: Simplify right side
    20.82x = 517.09
  5. Step 5: Solve for x
    x = 517.09/20.82
  6. Step 6: Final answer
    x = 24.84

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.