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Finding the Fourth Proportional to 20.82, 28.72 and 12.08

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Solution

The fourth proportional to 20.82, 28.72 and 12.08 is: 16.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.82 : 28.72 = 12.08 : x
  2. Step 2: Convert to fraction form
    20.82/28.72 = 12.08/x
  3. Step 3: Cross multiply
    20.82x = 28.72 × 12.08
  4. Step 4: Simplify right side
    20.82x = 346.85
  5. Step 5: Solve for x
    x = 346.85/20.82
  6. Step 6: Final answer
    x = 16.66

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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.