Home / 2,209.16-3,311.76-909.80

Finding the Fourth Proportional to 2,209.16, 3,311.76 and 909.80

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Solution

The fourth proportional to 2,209.16, 3,311.76 and 909.80 is: 1,363.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,209.16 : 3,311.76 = 909.80 : x
  2. Step 2: Convert to fraction form
    2,209.16/3,311.76 = 909.80/x
  3. Step 3: Cross multiply
    2,209.16x = 3,311.76 × 909.80
  4. Step 4: Simplify right side
    2,209.16x = 3,013,039.25
  5. Step 5: Solve for x
    x = 3,013,039.25/2,209.16
  6. Step 6: Final answer
    x = 1,363.88

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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.