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Finding the Fourth Proportional to 3,947.22, 5,447.13 and 2,178.82

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Solution

The fourth proportional to 3,947.22, 5,447.13 and 2,178.82 is: 3,006.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,947.22 : 5,447.13 = 2,178.82 : x
  2. Step 2: Convert to fraction form
    3,947.22/5,447.13 = 2,178.82/x
  3. Step 3: Cross multiply
    3,947.22x = 5,447.13 × 2,178.82
  4. Step 4: Simplify right side
    3,947.22x = 11,868,304.89
  5. Step 5: Solve for x
    x = 11,868,304.89/3,947.22
  6. Step 6: Final answer
    x = 3,006.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.