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Finding the Third Proportional to 519.75 and 689.75

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Solution

The third proportional to 519.75 and 689.75 is: 915.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.75 : 689.75 = 689.75 : x
  2. Step 2: Convert to fraction form
    519.75/689.75 = 689.75/x
  3. Step 3: Cross multiply
    519.75x = 689.75 × 689.75
  4. Step 4: Simplify right side
    519.75x = 475,755.06
  5. Step 5: Solve for x
    x = 475,755.06/519.75
  6. Step 6: Final answer
    x = 915.35

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.