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Finding the Third Proportional to 118.50 and 257.25

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Solution

The third proportional to 118.50 and 257.25 is: 558.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.50 : 257.25 = 257.25 : x
  2. Step 2: Convert to fraction form
    118.50/257.25 = 257.25/x
  3. Step 3: Cross multiply
    118.50x = 257.25 × 257.25
  4. Step 4: Simplify right side
    118.50x = 66,177.56
  5. Step 5: Solve for x
    x = 66,177.56/118.50
  6. Step 6: Final answer
    x = 558.46

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.