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Finding the Fourth Proportional to 90.97, 125.31 and 86.92

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Solution

The fourth proportional to 90.97, 125.31 and 86.92 is: 119.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.97 : 125.31 = 86.92 : x
  2. Step 2: Convert to fraction form
    90.97/125.31 = 86.92/x
  3. Step 3: Cross multiply
    90.97x = 125.31 × 86.92
  4. Step 4: Simplify right side
    90.97x = 10,891.95
  5. Step 5: Solve for x
    x = 10,891.95/90.97
  6. Step 6: Final answer
    x = 119.73

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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.