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Finding the Third Proportional to 619 and 686.50

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Solution

The third proportional to 619 and 686.50 is: 761.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    619 : 686.50 = 686.50 : x
  2. Step 2: Convert to fraction form
    619/686.50 = 686.50/x
  3. Step 3: Cross multiply
    619x = 686.50 × 686.50
  4. Step 4: Simplify right side
    619x = 471,282.25
  5. Step 5: Solve for x
    x = 471,282.25/619
  6. Step 6: Final answer
    x = 761.36

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.