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Finding the Fourth Proportional to 105.17, 144.94 and 80.66

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Solution

The fourth proportional to 105.17, 144.94 and 80.66 is: 111.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.17 : 144.94 = 80.66 : x
  2. Step 2: Convert to fraction form
    105.17/144.94 = 80.66/x
  3. Step 3: Cross multiply
    105.17x = 144.94 × 80.66
  4. Step 4: Simplify right side
    105.17x = 11,691.17
  5. Step 5: Solve for x
    x = 11,691.17/105.17
  6. Step 6: Final answer
    x = 111.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.