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Finding the Fourth Proportional to 91.31, 126.02 and 76.73

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Solution

The fourth proportional to 91.31, 126.02 and 76.73 is: 105.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.31 : 126.02 = 76.73 : x
  2. Step 2: Convert to fraction form
    91.31/126.02 = 76.73/x
  3. Step 3: Cross multiply
    91.31x = 126.02 × 76.73
  4. Step 4: Simplify right side
    91.31x = 9,669.13
  5. Step 5: Solve for x
    x = 9,669.13/91.31
  6. Step 6: Final answer
    x = 105.89

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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.