Home / 3,990.60-5,506.38-2,221.88

Finding the Fourth Proportional to 3,990.60, 5,506.38 and 2,221.88

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Solution

The fourth proportional to 3,990.60, 5,506.38 and 2,221.88 is: 3,065.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.60 : 5,506.38 = 2,221.88 : x
  2. Step 2: Convert to fraction form
    3,990.60/5,506.38 = 2,221.88/x
  3. Step 3: Cross multiply
    3,990.60x = 5,506.38 × 2,221.88
  4. Step 4: Simplify right side
    3,990.60x = 12,234,488.06
  5. Step 5: Solve for x
    x = 12,234,488.06/3,990.60
  6. Step 6: Final answer
    x = 3,065.83

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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.