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Finding the Fourth Proportional to 36.18, 54.37 and 20.97

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Solution

The fourth proportional to 36.18, 54.37 and 20.97 is: 31.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.18 : 54.37 = 20.97 : x
  2. Step 2: Convert to fraction form
    36.18/54.37 = 20.97/x
  3. Step 3: Cross multiply
    36.18x = 54.37 × 20.97
  4. Step 4: Simplify right side
    36.18x = 1,140.01
  5. Step 5: Solve for x
    x = 1,140.01/36.18
  6. Step 6: Final answer
    x = 31.51

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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.