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Finding the Third Proportional to 135.75 and 258.56

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Solution

The third proportional to 135.75 and 258.56 is: 492.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.75 : 258.56 = 258.56 : x
  2. Step 2: Convert to fraction form
    135.75/258.56 = 258.56/x
  3. Step 3: Cross multiply
    135.75x = 258.56 × 258.56
  4. Step 4: Simplify right side
    135.75x = 66,854.57
  5. Step 5: Solve for x
    x = 66,854.57/135.75
  6. Step 6: Final answer
    x = 492.48

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Why These Related Problems?

These problems maintain the same ratio (1.90) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.