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Finding the Fourth Proportional to 20.38, 30.50 and 16.56

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Solution

The fourth proportional to 20.38, 30.50 and 16.56 is: 24.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.38 : 30.50 = 16.56 : x
  2. Step 2: Convert to fraction form
    20.38/30.50 = 16.56/x
  3. Step 3: Cross multiply
    20.38x = 30.50 × 16.56
  4. Step 4: Simplify right side
    20.38x = 505.08
  5. Step 5: Solve for x
    x = 505.08/20.38
  6. Step 6: Final answer
    x = 24.78

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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.