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Finding the Third Proportional to 339.19 and 511.31

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Solution

The third proportional to 339.19 and 511.31 is: 770.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.19 : 511.31 = 511.31 : x
  2. Step 2: Convert to fraction form
    339.19/511.31 = 511.31/x
  3. Step 3: Cross multiply
    339.19x = 511.31 × 511.31
  4. Step 4: Simplify right side
    339.19x = 261,440.47
  5. Step 5: Solve for x
    x = 261,440.47/339.19
  6. Step 6: Final answer
    x = 770.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.