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Finding the Fourth Proportional to 13.55, 20.31 and 8.48

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Solution

The fourth proportional to 13.55, 20.31 and 8.48 is: 12.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.55 : 20.31 = 8.48 : x
  2. Step 2: Convert to fraction form
    13.55/20.31 = 8.48/x
  3. Step 3: Cross multiply
    13.55x = 20.31 × 8.48
  4. Step 4: Simplify right side
    13.55x = 172.23
  5. Step 5: Solve for x
    x = 172.23/13.55
  6. Step 6: Final answer
    x = 12.71

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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.