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Finding the Third Proportional to 91.97 and 139.22

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Solution

The third proportional to 91.97 and 139.22 is: 210.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.97 : 139.22 = 139.22 : x
  2. Step 2: Convert to fraction form
    91.97/139.22 = 139.22/x
  3. Step 3: Cross multiply
    91.97x = 139.22 × 139.22
  4. Step 4: Simplify right side
    91.97x = 19,381.86
  5. Step 5: Solve for x
    x = 19,381.86/91.97
  6. Step 6: Final answer
    x = 210.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.