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Finding the Fourth Proportional to 18.80, 28.16 and 13.44

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Solution

The fourth proportional to 18.80, 28.16 and 13.44 is: 20.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.80 : 28.16 = 13.44 : x
  2. Step 2: Convert to fraction form
    18.80/28.16 = 13.44/x
  3. Step 3: Cross multiply
    18.80x = 28.16 × 13.44
  4. Step 4: Simplify right side
    18.80x = 378.47
  5. Step 5: Solve for x
    x = 378.47/18.80
  6. Step 6: Final answer
    x = 20.13

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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.