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Finding the Fourth Proportional to 2,687.75, 4,031.56 and 838.85

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Solution

The fourth proportional to 2,687.75, 4,031.56 and 838.85 is: 1,258.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,687.75 : 4,031.56 = 838.85 : x
  2. Step 2: Convert to fraction form
    2,687.75/4,031.56 = 838.85/x
  3. Step 3: Cross multiply
    2,687.75x = 4,031.56 × 838.85
  4. Step 4: Simplify right side
    2,687.75x = 3,381,882.09
  5. Step 5: Solve for x
    x = 3,381,882.09/2,687.75
  6. Step 6: Final answer
    x = 1,258.26

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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.