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Finding the Fourth Proportional to 2,738.97, 4,108.95 and 791.28

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Solution

The fourth proportional to 2,738.97, 4,108.95 and 791.28 is: 1,187.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,738.97 : 4,108.95 = 791.28 : x
  2. Step 2: Convert to fraction form
    2,738.97/4,108.95 = 791.28/x
  3. Step 3: Cross multiply
    2,738.97x = 4,108.95 × 791.28
  4. Step 4: Simplify right side
    2,738.97x = 3,251,329.96
  5. Step 5: Solve for x
    x = 3,251,329.96/2,738.97
  6. Step 6: Final answer
    x = 1,187.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.