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Finding the Third Proportional to 386.75 and 491.38

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Solution

The third proportional to 386.75 and 491.38 is: 624.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.75 : 491.38 = 491.38 : x
  2. Step 2: Convert to fraction form
    386.75/491.38 = 491.38/x
  3. Step 3: Cross multiply
    386.75x = 491.38 × 491.38
  4. Step 4: Simplify right side
    386.75x = 241,449.39
  5. Step 5: Solve for x
    x = 241,449.39/386.75
  6. Step 6: Final answer
    x = 624.30

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.