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Finding the Third Proportional to 120.25 and 258.38

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Solution

The third proportional to 120.25 and 258.38 is: 555.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.25 : 258.38 = 258.38 : x
  2. Step 2: Convert to fraction form
    120.25/258.38 = 258.38/x
  3. Step 3: Cross multiply
    120.25x = 258.38 × 258.38
  4. Step 4: Simplify right side
    120.25x = 66,757.64
  5. Step 5: Solve for x
    x = 66,757.64/120.25
  6. Step 6: Final answer
    x = 555.16

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.