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Finding the Third Proportional to 921.38 and 1,966.78

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Solution

The third proportional to 921.38 and 1,966.78 is: 4,198.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.38 : 1,966.78 = 1,966.78 : x
  2. Step 2: Convert to fraction form
    921.38/1,966.78 = 1,966.78/x
  3. Step 3: Cross multiply
    921.38x = 1,966.78 × 1,966.78
  4. Step 4: Simplify right side
    921.38x = 3,868,228.49
  5. Step 5: Solve for x
    x = 3,868,228.49/921.38
  6. Step 6: Final answer
    x = 4,198.32

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.