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Finding the Fourth Proportional to 2,687.64, 4,031.46 and 838.68

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Solution

The fourth proportional to 2,687.64, 4,031.46 and 838.68 is: 1,258.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,687.64 : 4,031.46 = 838.68 : x
  2. Step 2: Convert to fraction form
    2,687.64/4,031.46 = 838.68/x
  3. Step 3: Cross multiply
    2,687.64x = 4,031.46 × 838.68
  4. Step 4: Simplify right side
    2,687.64x = 3,381,104.87
  5. Step 5: Solve for x
    x = 3,381,104.87/2,687.64
  6. Step 6: Final answer
    x = 1,258.02

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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.