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Finding the Third Proportional to 1,917 and 2,812.64

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Solution

The third proportional to 1,917 and 2,812.64 is: 4,126.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917 : 2,812.64 = 2,812.64 : x
  2. Step 2: Convert to fraction form
    1,917/2,812.64 = 2,812.64/x
  3. Step 3: Cross multiply
    1,917x = 2,812.64 × 2,812.64
  4. Step 4: Simplify right side
    1,917x = 7,910,947.29
  5. Step 5: Solve for x
    x = 7,910,947.29/1,917
  6. Step 6: Final answer
    x = 4,126.73

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.