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Finding the Third Proportional to 395.50 and 911.75

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Solution

The third proportional to 395.50 and 911.75 is: 2,101.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.50 : 911.75 = 911.75 : x
  2. Step 2: Convert to fraction form
    395.50/911.75 = 911.75/x
  3. Step 3: Cross multiply
    395.50x = 911.75 × 911.75
  4. Step 4: Simplify right side
    395.50x = 831,288.06
  5. Step 5: Solve for x
    x = 831,288.06/395.50
  6. Step 6: Final answer
    x = 2,101.87

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Why These Related Problems?

These problems maintain the same ratio (2.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.