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Finding the Fourth Proportional to 109.05, 163.55 and 54.15

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Solution

The fourth proportional to 109.05, 163.55 and 54.15 is: 81.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.05 : 163.55 = 54.15 : x
  2. Step 2: Convert to fraction form
    109.05/163.55 = 54.15/x
  3. Step 3: Cross multiply
    109.05x = 163.55 × 54.15
  4. Step 4: Simplify right side
    109.05x = 8,856.23
  5. Step 5: Solve for x
    x = 8,856.23/109.05
  6. Step 6: Final answer
    x = 81.21

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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.