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Finding the Third Proportional to 286.75 and 690.88

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Solution

The third proportional to 286.75 and 690.88 is: 1,664.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.75 : 690.88 = 690.88 : x
  2. Step 2: Convert to fraction form
    286.75/690.88 = 690.88/x
  3. Step 3: Cross multiply
    286.75x = 690.88 × 690.88
  4. Step 4: Simplify right side
    286.75x = 477,308.27
  5. Step 5: Solve for x
    x = 477,308.27/286.75
  6. Step 6: Final answer
    x = 1,664.54

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Why These Related Problems?

These problems maintain the same ratio (2.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.