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Finding the Third Proportional to 221.75 and 391

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Solution

The third proportional to 221.75 and 391 is: 689.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.75 : 391 = 391 : x
  2. Step 2: Convert to fraction form
    221.75/391 = 391/x
  3. Step 3: Cross multiply
    221.75x = 391 × 391
  4. Step 4: Simplify right side
    221.75x = 152,881
  5. Step 5: Solve for x
    x = 152,881/221.75
  6. Step 6: Final answer
    x = 689.43

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Why These Related Problems?

These problems maintain the same ratio (1.76) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.