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Finding the Third Proportional to 519.19 and 661.78

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Solution

The third proportional to 519.19 and 661.78 is: 843.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.19 : 661.78 = 661.78 : x
  2. Step 2: Convert to fraction form
    519.19/661.78 = 661.78/x
  3. Step 3: Cross multiply
    519.19x = 661.78 × 661.78
  4. Step 4: Simplify right side
    519.19x = 437,954.42
  5. Step 5: Solve for x
    x = 437,954.42/519.19
  6. Step 6: Final answer
    x = 843.54

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.