Home / 2,121.11-3,180.66-805.11

Finding the Fourth Proportional to 2,121.11, 3,180.66 and 805.11

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Solution

The fourth proportional to 2,121.11, 3,180.66 and 805.11 is: 1,207.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.11 : 3,180.66 = 805.11 : x
  2. Step 2: Convert to fraction form
    2,121.11/3,180.66 = 805.11/x
  3. Step 3: Cross multiply
    2,121.11x = 3,180.66 × 805.11
  4. Step 4: Simplify right side
    2,121.11x = 2,560,781.17
  5. Step 5: Solve for x
    x = 2,560,781.17/2,121.11
  6. Step 6: Final answer
    x = 1,207.29

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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.