Home / 2,812.11-3,879.20-2,147.78

Finding the Fourth Proportional to 2,812.11, 3,879.20 and 2,147.78

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Solution

The fourth proportional to 2,812.11, 3,879.20 and 2,147.78 is: 2,962.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812.11 : 3,879.20 = 2,147.78 : x
  2. Step 2: Convert to fraction form
    2,812.11/3,879.20 = 2,147.78/x
  3. Step 3: Cross multiply
    2,812.11x = 3,879.20 × 2,147.78
  4. Step 4: Simplify right side
    2,812.11x = 8,331,654.15
  5. Step 5: Solve for x
    x = 8,331,654.15/2,812.11
  6. Step 6: Final answer
    x = 2,962.78

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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.