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Finding the Third Proportional to 690.75 and 717.75

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Solution

The third proportional to 690.75 and 717.75 is: 745.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.75 : 717.75 = 717.75 : x
  2. Step 2: Convert to fraction form
    690.75/717.75 = 717.75/x
  3. Step 3: Cross multiply
    690.75x = 717.75 × 717.75
  4. Step 4: Simplify right side
    690.75x = 515,165.06
  5. Step 5: Solve for x
    x = 515,165.06/690.75
  6. Step 6: Final answer
    x = 745.81

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These problems maintain the same ratio (1.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.