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Finding the Third Proportional to 1,211.68 and 2,179.88

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Solution

The third proportional to 1,211.68 and 2,179.88 is: 3,921.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.68 : 2,179.88 = 2,179.88 : x
  2. Step 2: Convert to fraction form
    1,211.68/2,179.88 = 2,179.88/x
  3. Step 3: Cross multiply
    1,211.68x = 2,179.88 × 2,179.88
  4. Step 4: Simplify right side
    1,211.68x = 4,751,880.56
  5. Step 5: Solve for x
    x = 4,751,880.56/1,211.68
  6. Step 6: Final answer
    x = 3,921.74

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Why These Related Problems?

These problems maintain the same ratio (1.80) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.