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Finding the Fourth Proportional to 2,811.78, 4,217.81 and 864

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Solution

The fourth proportional to 2,811.78, 4,217.81 and 864 is: 1,296.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.78 : 4,217.81 = 864 : x
  2. Step 2: Convert to fraction form
    2,811.78/4,217.81 = 864/x
  3. Step 3: Cross multiply
    2,811.78x = 4,217.81 × 864
  4. Step 4: Simplify right side
    2,811.78x = 3,644,183.52
  5. Step 5: Solve for x
    x = 3,644,183.52/2,811.78
  6. Step 6: Final answer
    x = 1,296.04

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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.