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Finding the Fourth Proportional to 2,660.56, 3,991.49 and 811.71

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Solution

The fourth proportional to 2,660.56, 3,991.49 and 811.71 is: 1,217.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.56 : 3,991.49 = 811.71 : x
  2. Step 2: Convert to fraction form
    2,660.56/3,991.49 = 811.71/x
  3. Step 3: Cross multiply
    2,660.56x = 3,991.49 × 811.71
  4. Step 4: Simplify right side
    2,660.56x = 3,239,908.33
  5. Step 5: Solve for x
    x = 3,239,908.33/2,660.56
  6. Step 6: Final answer
    x = 1,217.75

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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.