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Finding the Third Proportional to 340.45 and 742.78

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Solution

The third proportional to 340.45 and 742.78 is: 1,620.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.45 : 742.78 = 742.78 : x
  2. Step 2: Convert to fraction form
    340.45/742.78 = 742.78/x
  3. Step 3: Cross multiply
    340.45x = 742.78 × 742.78
  4. Step 4: Simplify right side
    340.45x = 551,723.99
  5. Step 5: Solve for x
    x = 551,723.99/340.45
  6. Step 6: Final answer
    x = 1,620.56

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.