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Finding the Fourth Proportional to 2,638.27, 3,956.95 and 994.38

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Solution

The fourth proportional to 2,638.27, 3,956.95 and 994.38 is: 1,491.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,638.27 : 3,956.95 = 994.38 : x
  2. Step 2: Convert to fraction form
    2,638.27/3,956.95 = 994.38/x
  3. Step 3: Cross multiply
    2,638.27x = 3,956.95 × 994.38
  4. Step 4: Simplify right side
    2,638.27x = 3,934,698.35
  5. Step 5: Solve for x
    x = 3,934,698.35/2,638.27
  6. Step 6: Final answer
    x = 1,491.39

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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.