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Finding the Fourth Proportional to 54.35, 81.47 and 20.11

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Solution

The fourth proportional to 54.35, 81.47 and 20.11 is: 30.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.35 : 81.47 = 20.11 : x
  2. Step 2: Convert to fraction form
    54.35/81.47 = 20.11/x
  3. Step 3: Cross multiply
    54.35x = 81.47 × 20.11
  4. Step 4: Simplify right side
    54.35x = 1,638.20
  5. Step 5: Solve for x
    x = 1,638.20/54.35
  6. Step 6: Final answer
    x = 30.14

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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.