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Finding the Third Proportional to 105 and 205.25

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Solution

The third proportional to 105 and 205.25 is: 401.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    105 : 205.25 = 205.25 : x
  2. Step 2: Convert to fraction form
    105/205.25 = 205.25/x
  3. Step 3: Cross multiply
    105x = 205.25 × 205.25
  4. Step 4: Simplify right side
    105x = 42,127.56
  5. Step 5: Solve for x
    x = 42,127.56/105
  6. Step 6: Final answer
    x = 401.21

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Why These Related Problems?

These problems maintain the same ratio (1.95) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.