Home / 7,947.21-11,921.39-2,103.75

Finding the Fourth Proportional to 7,947.21, 11,921.39 and 2,103.75

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Solution

The fourth proportional to 7,947.21, 11,921.39 and 2,103.75 is: 3,155.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,947.21 : 11,921.39 = 2,103.75 : x
  2. Step 2: Convert to fraction form
    7,947.21/11,921.39 = 2,103.75/x
  3. Step 3: Cross multiply
    7,947.21x = 11,921.39 × 2,103.75
  4. Step 4: Simplify right side
    7,947.21x = 25,079,613.69
  5. Step 5: Solve for x
    x = 25,079,613.69/7,947.21
  6. Step 6: Final answer
    x = 3,155.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.