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Finding the Third Proportional to 258.29 and 396.67

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Solution

The third proportional to 258.29 and 396.67 is: 609.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.29 : 396.67 = 396.67 : x
  2. Step 2: Convert to fraction form
    258.29/396.67 = 396.67/x
  3. Step 3: Cross multiply
    258.29x = 396.67 × 396.67
  4. Step 4: Simplify right side
    258.29x = 157,345.48
  5. Step 5: Solve for x
    x = 157,345.48/258.29
  6. Step 6: Final answer
    x = 609.17

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.