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Finding the Third Proportional to 257.75 and 386.88

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Solution

The third proportional to 257.75 and 386.88 is: 580.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.75 : 386.88 = 386.88 : x
  2. Step 2: Convert to fraction form
    257.75/386.88 = 386.88/x
  3. Step 3: Cross multiply
    257.75x = 386.88 × 386.88
  4. Step 4: Simplify right side
    257.75x = 149,672.27
  5. Step 5: Solve for x
    x = 149,672.27/257.75
  6. Step 6: Final answer
    x = 580.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.