Home / 3,990.34-5,506.50-2,221.90

Finding the Fourth Proportional to 3,990.34, 5,506.50 and 2,221.90

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Solution

The fourth proportional to 3,990.34, 5,506.50 and 2,221.90 is: 3,066.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.34 : 5,506.50 = 2,221.90 : x
  2. Step 2: Convert to fraction form
    3,990.34/5,506.50 = 2,221.90/x
  3. Step 3: Cross multiply
    3,990.34x = 5,506.50 × 2,221.90
  4. Step 4: Simplify right side
    3,990.34x = 12,234,892.35
  5. Step 5: Solve for x
    x = 12,234,892.35/3,990.34
  6. Step 6: Final answer
    x = 3,066.13

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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.