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Finding the Fourth Proportional to 2,757.88, 4,137.40 and 809.92

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Solution

The fourth proportional to 2,757.88, 4,137.40 and 809.92 is: 1,215.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,757.88 : 4,137.40 = 809.92 : x
  2. Step 2: Convert to fraction form
    2,757.88/4,137.40 = 809.92/x
  3. Step 3: Cross multiply
    2,757.88x = 4,137.40 × 809.92
  4. Step 4: Simplify right side
    2,757.88x = 3,350,963.01
  5. Step 5: Solve for x
    x = 3,350,963.01/2,757.88
  6. Step 6: Final answer
    x = 1,215.05

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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.