Home / 2,760.15-4,139.77-811.90

Finding the Fourth Proportional to 2,760.15, 4,139.77 and 811.90

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Solution

The fourth proportional to 2,760.15, 4,139.77 and 811.90 is: 1,217.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,760.15 : 4,139.77 = 811.90 : x
  2. Step 2: Convert to fraction form
    2,760.15/4,139.77 = 811.90/x
  3. Step 3: Cross multiply
    2,760.15x = 4,139.77 × 811.90
  4. Step 4: Simplify right side
    2,760.15x = 3,361,073.43
  5. Step 5: Solve for x
    x = 3,361,073.43/2,760.15
  6. Step 6: Final answer
    x = 1,217.71

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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.