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Finding the Fourth Proportional to 20.47, 28.24 and 13.19

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Solution

The fourth proportional to 20.47, 28.24 and 13.19 is: 18.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.47 : 28.24 = 13.19 : x
  2. Step 2: Convert to fraction form
    20.47/28.24 = 13.19/x
  3. Step 3: Cross multiply
    20.47x = 28.24 × 13.19
  4. Step 4: Simplify right side
    20.47x = 372.38
  5. Step 5: Solve for x
    x = 372.38/20.47
  6. Step 6: Final answer
    x = 18.19

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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.