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Finding the Third Proportional to 155.67 and 258.19

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Solution

The third proportional to 155.67 and 258.19 is: 428.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.67 : 258.19 = 258.19 : x
  2. Step 2: Convert to fraction form
    155.67/258.19 = 258.19/x
  3. Step 3: Cross multiply
    155.67x = 258.19 × 258.19
  4. Step 4: Simplify right side
    155.67x = 66,660.79
  5. Step 5: Solve for x
    x = 66,660.79/155.67
  6. Step 6: Final answer
    x = 428.21

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.