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Finding the Third Proportional to 351.50 and 769.75

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Solution

The third proportional to 351.50 and 769.75 is: 1,685.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.50 : 769.75 = 769.75 : x
  2. Step 2: Convert to fraction form
    351.50/769.75 = 769.75/x
  3. Step 3: Cross multiply
    351.50x = 769.75 × 769.75
  4. Step 4: Simplify right side
    351.50x = 592,515.06
  5. Step 5: Solve for x
    x = 592,515.06/351.50
  6. Step 6: Final answer
    x = 1,685.68

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.