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Finding the Fourth Proportional to 2,626.81, 3,940 and 871.24

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Solution

The fourth proportional to 2,626.81, 3,940 and 871.24 is: 1,306.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,626.81 : 3,940 = 871.24 : x
  2. Step 2: Convert to fraction form
    2,626.81/3,940 = 871.24/x
  3. Step 3: Cross multiply
    2,626.81x = 3,940 × 871.24
  4. Step 4: Simplify right side
    2,626.81x = 3,432,685.60
  5. Step 5: Solve for x
    x = 3,432,685.60/2,626.81
  6. Step 6: Final answer
    x = 1,306.79

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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.