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Finding the Fourth Proportional to 126.89, 190.35 and 81.17

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Solution

The fourth proportional to 126.89, 190.35 and 81.17 is: 121.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.89 : 190.35 = 81.17 : x
  2. Step 2: Convert to fraction form
    126.89/190.35 = 81.17/x
  3. Step 3: Cross multiply
    126.89x = 190.35 × 81.17
  4. Step 4: Simplify right side
    126.89x = 15,449.76
  5. Step 5: Solve for x
    x = 15,449.76/126.89
  6. Step 6: Final answer
    x = 121.76

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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.