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Finding the Fourth Proportional to 2,209.12, 3,314.09 and 728.43

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Solution

The fourth proportional to 2,209.12, 3,314.09 and 728.43 is: 1,092.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,209.12 : 3,314.09 = 728.43 : x
  2. Step 2: Convert to fraction form
    2,209.12/3,314.09 = 728.43/x
  3. Step 3: Cross multiply
    2,209.12x = 3,314.09 × 728.43
  4. Step 4: Simplify right side
    2,209.12x = 2,414,082.58
  5. Step 5: Solve for x
    x = 2,414,082.58/2,209.12
  6. Step 6: Final answer
    x = 1,092.78

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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.