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Finding the Third Proportional to 213.50 and 391.75

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Solution

The third proportional to 213.50 and 391.75 is: 718.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.50 : 391.75 = 391.75 : x
  2. Step 2: Convert to fraction form
    213.50/391.75 = 391.75/x
  3. Step 3: Cross multiply
    213.50x = 391.75 × 391.75
  4. Step 4: Simplify right side
    213.50x = 153,468.06
  5. Step 5: Solve for x
    x = 153,468.06/213.50
  6. Step 6: Final answer
    x = 718.82

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Why These Related Problems?

These problems maintain the same ratio (1.83) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.