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Finding the Fourth Proportional to 109.36, 163.82 and 81.80

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Solution

The fourth proportional to 109.36, 163.82 and 81.80 is: 122.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.36 : 163.82 = 81.80 : x
  2. Step 2: Convert to fraction form
    109.36/163.82 = 81.80/x
  3. Step 3: Cross multiply
    109.36x = 163.82 × 81.80
  4. Step 4: Simplify right side
    109.36x = 13,400.48
  5. Step 5: Solve for x
    x = 13,400.48/109.36
  6. Step 6: Final answer
    x = 122.54

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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.