Home / 3,947.12-5,447-2,178.64

Finding the Fourth Proportional to 3,947.12, 5,447 and 2,178.64

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Solution

The fourth proportional to 3,947.12, 5,447 and 2,178.64 is: 3,006.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,947.12 : 5,447 = 2,178.64 : x
  2. Step 2: Convert to fraction form
    3,947.12/5,447 = 2,178.64/x
  3. Step 3: Cross multiply
    3,947.12x = 5,447 × 2,178.64
  4. Step 4: Simplify right side
    3,947.12x = 11,867,052.08
  5. Step 5: Solve for x
    x = 11,867,052.08/3,947.12
  6. Step 6: Final answer
    x = 3,006.51

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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.