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Finding the Third Proportional to 1,311.19 and 2,855.25

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Solution

The third proportional to 1,311.19 and 2,855.25 is: 6,217.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.19 : 2,855.25 = 2,855.25 : x
  2. Step 2: Convert to fraction form
    1,311.19/2,855.25 = 2,855.25/x
  3. Step 3: Cross multiply
    1,311.19x = 2,855.25 × 2,855.25
  4. Step 4: Simplify right side
    1,311.19x = 8,152,452.56
  5. Step 5: Solve for x
    x = 8,152,452.56/1,311.19
  6. Step 6: Final answer
    x = 6,217.61

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.