Home / 3,947.15-5,447.12-2,178.83

Finding the Fourth Proportional to 3,947.15, 5,447.12 and 2,178.83

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Solution

The fourth proportional to 3,947.15, 5,447.12 and 2,178.83 is: 3,006.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,947.15 : 5,447.12 = 2,178.83 : x
  2. Step 2: Convert to fraction form
    3,947.15/5,447.12 = 2,178.83/x
  3. Step 3: Cross multiply
    3,947.15x = 5,447.12 × 2,178.83
  4. Step 4: Simplify right side
    3,947.15x = 11,868,351.19
  5. Step 5: Solve for x
    x = 11,868,351.19/3,947.15
  6. Step 6: Final answer
    x = 3,006.81

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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.