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Finding the Fourth Proportional to 126.88, 174.85 and 91.85

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Solution

The fourth proportional to 126.88, 174.85 and 91.85 is: 126.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.88 : 174.85 = 91.85 : x
  2. Step 2: Convert to fraction form
    126.88/174.85 = 91.85/x
  3. Step 3: Cross multiply
    126.88x = 174.85 × 91.85
  4. Step 4: Simplify right side
    126.88x = 16,059.97
  5. Step 5: Solve for x
    x = 16,059.97/126.88
  6. Step 6: Final answer
    x = 126.58

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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.