Home / 3,947.20-5,447.18-2,178.81

Finding the Fourth Proportional to 3,947.20, 5,447.18 and 2,178.81

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Solution

The fourth proportional to 3,947.20, 5,447.18 and 2,178.81 is: 3,006.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,947.20 : 5,447.18 = 2,178.81 : x
  2. Step 2: Convert to fraction form
    3,947.20/5,447.18 = 2,178.81/x
  3. Step 3: Cross multiply
    3,947.20x = 5,447.18 × 2,178.81
  4. Step 4: Simplify right side
    3,947.20x = 11,868,332.13
  5. Step 5: Solve for x
    x = 11,868,332.13/3,947.20
  6. Step 6: Final answer
    x = 3,006.78

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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.