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Finding the Fourth Proportional to 36.28, 54.40 and 12.23

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Solution

The fourth proportional to 36.28, 54.40 and 12.23 is: 18.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.28 : 54.40 = 12.23 : x
  2. Step 2: Convert to fraction form
    36.28/54.40 = 12.23/x
  3. Step 3: Cross multiply
    36.28x = 54.40 × 12.23
  4. Step 4: Simplify right side
    36.28x = 664.98
  5. Step 5: Solve for x
    x = 664.98/36.28
  6. Step 6: Final answer
    x = 18.33

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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.