Home / 9,990.20-13,781.29-8,103.92

Finding the Fourth Proportional to 9,990.20, 13,781.29 and 8,103.92

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Solution

The fourth proportional to 9,990.20, 13,781.29 and 8,103.92 is: 11,179.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990.20 : 13,781.29 = 8,103.92 : x
  2. Step 2: Convert to fraction form
    9,990.20/13,781.29 = 8,103.92/x
  3. Step 3: Cross multiply
    9,990.20x = 13,781.29 × 8,103.92
  4. Step 4: Simplify right side
    9,990.20x = 111,682,471.66
  5. Step 5: Solve for x
    x = 111,682,471.66/9,990.20
  6. Step 6: Final answer
    x = 11,179.20

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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.