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Finding the Fourth Proportional to 107.97, 149.07 and 91.63

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Solution

The fourth proportional to 107.97, 149.07 and 91.63 is: 126.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.97 : 149.07 = 91.63 : x
  2. Step 2: Convert to fraction form
    107.97/149.07 = 91.63/x
  3. Step 3: Cross multiply
    107.97x = 149.07 × 91.63
  4. Step 4: Simplify right side
    107.97x = 13,659.28
  5. Step 5: Solve for x
    x = 13,659.28/107.97
  6. Step 6: Final answer
    x = 126.51

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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.