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Finding the Third Proportional to 381.75 and 910.50

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Solution

The third proportional to 381.75 and 910.50 is: 2,171.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.75 : 910.50 = 910.50 : x
  2. Step 2: Convert to fraction form
    381.75/910.50 = 910.50/x
  3. Step 3: Cross multiply
    381.75x = 910.50 × 910.50
  4. Step 4: Simplify right side
    381.75x = 829,010.25
  5. Step 5: Solve for x
    x = 829,010.25/381.75
  6. Step 6: Final answer
    x = 2,171.61

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Why These Related Problems?

These problems maintain the same ratio (2.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.