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Finding the Third Proportional to 269.50 and 647.75

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Solution

The third proportional to 269.50 and 647.75 is: 1,556.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.50 : 647.75 = 647.75 : x
  2. Step 2: Convert to fraction form
    269.50/647.75 = 647.75/x
  3. Step 3: Cross multiply
    269.50x = 647.75 × 647.75
  4. Step 4: Simplify right side
    269.50x = 419,580.06
  5. Step 5: Solve for x
    x = 419,580.06/269.50
  6. Step 6: Final answer
    x = 1,556.88

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Why These Related Problems?

These problems maintain the same ratio (2.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.