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Finding the Fourth Proportional to 2,791.88, 4,187.68 and 739.88

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Solution

The fourth proportional to 2,791.88, 4,187.68 and 739.88 is: 1,109.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,791.88 : 4,187.68 = 739.88 : x
  2. Step 2: Convert to fraction form
    2,791.88/4,187.68 = 739.88/x
  3. Step 3: Cross multiply
    2,791.88x = 4,187.68 × 739.88
  4. Step 4: Simplify right side
    2,791.88x = 3,098,380.68
  5. Step 5: Solve for x
    x = 3,098,380.68/2,791.88
  6. Step 6: Final answer
    x = 1,109.78

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1.5x scale

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.