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Finding the Third Proportional to 91 and 141

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Solution

The third proportional to 91 and 141 is: 218.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    91 : 141 = 141 : x
  2. Step 2: Convert to fraction form
    91/141 = 141/x
  3. Step 3: Cross multiply
    91x = 141 × 141
  4. Step 4: Simplify right side
    91x = 19,881
  5. Step 5: Solve for x
    x = 19,881/91
  6. Step 6: Final answer
    x = 218.47

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.