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Finding the Third Proportional to 819.50 and 1,270.50

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Solution

The third proportional to 819.50 and 1,270.50 is: 1,969.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.50 : 1,270.50 = 1,270.50 : x
  2. Step 2: Convert to fraction form
    819.50/1,270.50 = 1,270.50/x
  3. Step 3: Cross multiply
    819.50x = 1,270.50 × 1,270.50
  4. Step 4: Simplify right side
    819.50x = 1,614,170.25
  5. Step 5: Solve for x
    x = 1,614,170.25/819.50
  6. Step 6: Final answer
    x = 1,969.70

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.