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Finding the Fourth Proportional to 2,786.56, 4,179.88 and 838.64

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Solution

The fourth proportional to 2,786.56, 4,179.88 and 838.64 is: 1,257.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,786.56 : 4,179.88 = 838.64 : x
  2. Step 2: Convert to fraction form
    2,786.56/4,179.88 = 838.64/x
  3. Step 3: Cross multiply
    2,786.56x = 4,179.88 × 838.64
  4. Step 4: Simplify right side
    2,786.56x = 3,505,414.56
  5. Step 5: Solve for x
    x = 3,505,414.56/2,786.56
  6. Step 6: Final answer
    x = 1,257.97

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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.