Home / 2,660.20-3,990.27-811.30

Finding the Fourth Proportional to 2,660.20, 3,990.27 and 811.30

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Solution

The fourth proportional to 2,660.20, 3,990.27 and 811.30 is: 1,216.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.20 : 3,990.27 = 811.30 : x
  2. Step 2: Convert to fraction form
    2,660.20/3,990.27 = 811.30/x
  3. Step 3: Cross multiply
    2,660.20x = 3,990.27 × 811.30
  4. Step 4: Simplify right side
    2,660.20x = 3,237,306.05
  5. Step 5: Solve for x
    x = 3,237,306.05/2,660.20
  6. Step 6: Final answer
    x = 1,216.94

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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.