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Finding the Third Proportional to 258.75 and 345

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Solution

The third proportional to 258.75 and 345 is: 460

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.75 : 345 = 345 : x
  2. Step 2: Convert to fraction form
    258.75/345 = 345/x
  3. Step 3: Cross multiply
    258.75x = 345 × 345
  4. Step 4: Simplify right side
    258.75x = 119,025
  5. Step 5: Solve for x
    x = 119,025/258.75
  6. Step 6: Final answer
    x = 460

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.