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Finding the Fourth Proportional to 91.17, 125.82 and 80.28

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Solution

The fourth proportional to 91.17, 125.82 and 80.28 is: 110.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.17 : 125.82 = 80.28 : x
  2. Step 2: Convert to fraction form
    91.17/125.82 = 80.28/x
  3. Step 3: Cross multiply
    91.17x = 125.82 × 80.28
  4. Step 4: Simplify right side
    91.17x = 10,100.83
  5. Step 5: Solve for x
    x = 10,100.83/91.17
  6. Step 6: Final answer
    x = 110.79

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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.