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Finding the Third Proportional to 690 and 975

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Solution

The third proportional to 690 and 975 is: 1,377.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    690 : 975 = 975 : x
  2. Step 2: Convert to fraction form
    690/975 = 975/x
  3. Step 3: Cross multiply
    690x = 975 × 975
  4. Step 4: Simplify right side
    690x = 950,625
  5. Step 5: Solve for x
    x = 950,625/690
  6. Step 6: Final answer
    x = 1,377.72

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These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.