Home / 3,872.80-5,805.15-2,115.10

Finding the Fourth Proportional to 3,872.80, 5,805.15 and 2,115.10

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Solution

The fourth proportional to 3,872.80, 5,805.15 and 2,115.10 is: 3,170.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,872.80 : 5,805.15 = 2,115.10 : x
  2. Step 2: Convert to fraction form
    3,872.80/5,805.15 = 2,115.10/x
  3. Step 3: Cross multiply
    3,872.80x = 5,805.15 × 2,115.10
  4. Step 4: Simplify right side
    3,872.80x = 12,278,472.77
  5. Step 5: Solve for x
    x = 12,278,472.77/3,872.80
  6. Step 6: Final answer
    x = 3,170.44

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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.