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Finding the Third Proportional to 513.28 and 679.78

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Solution

The third proportional to 513.28 and 679.78 is: 900.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.28 : 679.78 = 679.78 : x
  2. Step 2: Convert to fraction form
    513.28/679.78 = 679.78/x
  3. Step 3: Cross multiply
    513.28x = 679.78 × 679.78
  4. Step 4: Simplify right side
    513.28x = 462,102.55
  5. Step 5: Solve for x
    x = 462,102.55/513.28
  6. Step 6: Final answer
    x = 900.29

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.