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Finding the Third Proportional to 389.25 and 605.25

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Solution

The third proportional to 389.25 and 605.25 is: 941.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.25 : 605.25 = 605.25 : x
  2. Step 2: Convert to fraction form
    389.25/605.25 = 605.25/x
  3. Step 3: Cross multiply
    389.25x = 605.25 × 605.25
  4. Step 4: Simplify right side
    389.25x = 366,327.56
  5. Step 5: Solve for x
    x = 366,327.56/389.25
  6. Step 6: Final answer
    x = 941.11

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.