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Finding the Fourth Proportional to 2,769.62, 4,155.11 and 821.83

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Solution

The fourth proportional to 2,769.62, 4,155.11 and 821.83 is: 1,232.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,769.62 : 4,155.11 = 821.83 : x
  2. Step 2: Convert to fraction form
    2,769.62/4,155.11 = 821.83/x
  3. Step 3: Cross multiply
    2,769.62x = 4,155.11 × 821.83
  4. Step 4: Simplify right side
    2,769.62x = 3,414,785.72
  5. Step 5: Solve for x
    x = 3,414,785.72/2,769.62
  6. Step 6: Final answer
    x = 1,232.94

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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.