Home / 3,947.10-5,446.92-2,178.78

Finding the Fourth Proportional to 3,947.10, 5,446.92 and 2,178.78

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Solution

The fourth proportional to 3,947.10, 5,446.92 and 2,178.78 is: 3,006.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,947.10 : 5,446.92 = 2,178.78 : x
  2. Step 2: Convert to fraction form
    3,947.10/5,446.92 = 2,178.78/x
  3. Step 3: Cross multiply
    3,947.10x = 5,446.92 × 2,178.78
  4. Step 4: Simplify right side
    3,947.10x = 11,867,640.36
  5. Step 5: Solve for x
    x = 11,867,640.36/3,947.10
  6. Step 6: Final answer
    x = 3,006.67

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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.