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Finding the Fourth Proportional to 13.45, 20.16 and 8.38

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Solution

The fourth proportional to 13.45, 20.16 and 8.38 is: 12.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.45 : 20.16 = 8.38 : x
  2. Step 2: Convert to fraction form
    13.45/20.16 = 8.38/x
  3. Step 3: Cross multiply
    13.45x = 20.16 × 8.38
  4. Step 4: Simplify right side
    13.45x = 168.84
  5. Step 5: Solve for x
    x = 168.84/13.45
  6. Step 6: Final answer
    x = 12.56

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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.