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Finding the Third Proportional to 678.38 and 1,397.25

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Solution

The third proportional to 678.38 and 1,397.25 is: 2,877.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.38 : 1,397.25 = 1,397.25 : x
  2. Step 2: Convert to fraction form
    678.38/1,397.25 = 1,397.25/x
  3. Step 3: Cross multiply
    678.38x = 1,397.25 × 1,397.25
  4. Step 4: Simplify right side
    678.38x = 1,952,307.56
  5. Step 5: Solve for x
    x = 1,952,307.56/678.38
  6. Step 6: Final answer
    x = 2,877.92

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.