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Finding the Third Proportional to 686.75 and 1,019.38

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Solution

The third proportional to 686.75 and 1,019.38 is: 1,513.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.75 : 1,019.38 = 1,019.38 : x
  2. Step 2: Convert to fraction form
    686.75/1,019.38 = 1,019.38/x
  3. Step 3: Cross multiply
    686.75x = 1,019.38 × 1,019.38
  4. Step 4: Simplify right side
    686.75x = 1,039,125.39
  5. Step 5: Solve for x
    x = 1,039,125.39/686.75
  6. Step 6: Final answer
    x = 1,513.11

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.