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Finding the Third Proportional to 118.50 and 257.75

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Solution

The third proportional to 118.50 and 257.75 is: 560.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.50 : 257.75 = 257.75 : x
  2. Step 2: Convert to fraction form
    118.50/257.75 = 257.75/x
  3. Step 3: Cross multiply
    118.50x = 257.75 × 257.75
  4. Step 4: Simplify right side
    118.50x = 66,435.06
  5. Step 5: Solve for x
    x = 66,435.06/118.50
  6. Step 6: Final answer
    x = 560.63

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.