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Finding the Fourth Proportional to 2,786.12, 4,179.20 and 838.28

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Solution

The fourth proportional to 2,786.12, 4,179.20 and 838.28 is: 1,257.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,786.12 : 4,179.20 = 838.28 : x
  2. Step 2: Convert to fraction form
    2,786.12/4,179.20 = 838.28/x
  3. Step 3: Cross multiply
    2,786.12x = 4,179.20 × 838.28
  4. Step 4: Simplify right side
    2,786.12x = 3,503,339.78
  5. Step 5: Solve for x
    x = 3,503,339.78/2,786.12
  6. Step 6: Final answer
    x = 1,257.43

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1.5x scale

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.