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Finding the Fourth Proportional to 20.54, 28.32 and 13.62

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Solution

The fourth proportional to 20.54, 28.32 and 13.62 is: 18.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.54 : 28.32 = 13.62 : x
  2. Step 2: Convert to fraction form
    20.54/28.32 = 13.62/x
  3. Step 3: Cross multiply
    20.54x = 28.32 × 13.62
  4. Step 4: Simplify right side
    20.54x = 385.72
  5. Step 5: Solve for x
    x = 385.72/20.54
  6. Step 6: Final answer
    x = 18.78

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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.