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Finding the Fourth Proportional to 2,791.70, 4,187.55 and 843.91

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Solution

The fourth proportional to 2,791.70, 4,187.55 and 843.91 is: 1,265.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,791.70 : 4,187.55 = 843.91 : x
  2. Step 2: Convert to fraction form
    2,791.70/4,187.55 = 843.91/x
  3. Step 3: Cross multiply
    2,791.70x = 4,187.55 × 843.91
  4. Step 4: Simplify right side
    2,791.70x = 3,533,915.32
  5. Step 5: Solve for x
    x = 3,533,915.32/2,791.70
  6. Step 6: Final answer
    x = 1,265.87

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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.