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Finding the Fourth Proportional to 109.11, 163.44 and 54.18

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Solution

The fourth proportional to 109.11, 163.44 and 54.18 is: 81.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.11 : 163.44 = 54.18 : x
  2. Step 2: Convert to fraction form
    109.11/163.44 = 54.18/x
  3. Step 3: Cross multiply
    109.11x = 163.44 × 54.18
  4. Step 4: Simplify right side
    109.11x = 8,855.18
  5. Step 5: Solve for x
    x = 8,855.18/109.11
  6. Step 6: Final answer
    x = 81.16

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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.