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Finding the Fourth Proportional to 109.11, 163.76 and 72.45

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Solution

The fourth proportional to 109.11, 163.76 and 72.45 is: 108.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.11 : 163.76 = 72.45 : x
  2. Step 2: Convert to fraction form
    109.11/163.76 = 72.45/x
  3. Step 3: Cross multiply
    109.11x = 163.76 × 72.45
  4. Step 4: Simplify right side
    109.11x = 11,863.98
  5. Step 5: Solve for x
    x = 11,863.98/109.11
  6. Step 6: Final answer
    x = 108.73

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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.