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Finding the Third Proportional to 2,906.81 and 4,218.38

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Solution

The third proportional to 2,906.81 and 4,218.38 is: 6,121.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,906.81 : 4,218.38 = 4,218.38 : x
  2. Step 2: Convert to fraction form
    2,906.81/4,218.38 = 4,218.38/x
  3. Step 3: Cross multiply
    2,906.81x = 4,218.38 × 4,218.38
  4. Step 4: Simplify right side
    2,906.81x = 17,794,687.64
  5. Step 5: Solve for x
    x = 17,794,687.64/2,906.81
  6. Step 6: Final answer
    x = 6,121.72

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.