Home / 3,947.19-5,447.28-2,178.74

Finding the Fourth Proportional to 3,947.19, 5,447.28 and 2,178.74

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Solution

The fourth proportional to 3,947.19, 5,447.28 and 2,178.74 is: 3,006.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,947.19 : 5,447.28 = 2,178.74 : x
  2. Step 2: Convert to fraction form
    3,947.19/5,447.28 = 2,178.74/x
  3. Step 3: Cross multiply
    3,947.19x = 5,447.28 × 2,178.74
  4. Step 4: Simplify right side
    3,947.19x = 11,868,179.59
  5. Step 5: Solve for x
    x = 11,868,179.59/3,947.19
  6. Step 6: Final answer
    x = 3,006.74

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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.