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Finding the Third Proportional to 216.88 and 391.75

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Solution

The third proportional to 216.88 and 391.75 is: 707.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.88 : 391.75 = 391.75 : x
  2. Step 2: Convert to fraction form
    216.88/391.75 = 391.75/x
  3. Step 3: Cross multiply
    216.88x = 391.75 × 391.75
  4. Step 4: Simplify right side
    216.88x = 153,468.06
  5. Step 5: Solve for x
    x = 153,468.06/216.88
  6. Step 6: Final answer
    x = 707.63

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Why These Related Problems?

These problems maintain the same ratio (1.81) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.