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Finding the Fourth Proportional to 107.96, 149.16 and 91.76

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Solution

The fourth proportional to 107.96, 149.16 and 91.76 is: 126.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.96 : 149.16 = 91.76 : x
  2. Step 2: Convert to fraction form
    107.96/149.16 = 91.76/x
  3. Step 3: Cross multiply
    107.96x = 149.16 × 91.76
  4. Step 4: Simplify right side
    107.96x = 13,686.92
  5. Step 5: Solve for x
    x = 13,686.92/107.96
  6. Step 6: Final answer
    x = 126.78

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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.