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Finding the Fourth Proportional to 2,769.05, 4,154.39 and 821.31

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Solution

The fourth proportional to 2,769.05, 4,154.39 and 821.31 is: 1,232.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,769.05 : 4,154.39 = 821.31 : x
  2. Step 2: Convert to fraction form
    2,769.05/4,154.39 = 821.31/x
  3. Step 3: Cross multiply
    2,769.05x = 4,154.39 × 821.31
  4. Step 4: Simplify right side
    2,769.05x = 3,412,037.94
  5. Step 5: Solve for x
    x = 3,412,037.94/2,769.05
  6. Step 6: Final answer
    x = 1,232.21

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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.