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Finding the Fourth Proportional to 115.49, 173.28 and 81.17

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Solution

The fourth proportional to 115.49, 173.28 and 81.17 is: 121.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.49 : 173.28 = 81.17 : x
  2. Step 2: Convert to fraction form
    115.49/173.28 = 81.17/x
  3. Step 3: Cross multiply
    115.49x = 173.28 × 81.17
  4. Step 4: Simplify right side
    115.49x = 14,065.14
  5. Step 5: Solve for x
    x = 14,065.14/115.49
  6. Step 6: Final answer
    x = 121.79

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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.