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Finding the Third Proportional to 120.94 and 155.81

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Solution

The third proportional to 120.94 and 155.81 is: 200.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.94 : 155.81 = 155.81 : x
  2. Step 2: Convert to fraction form
    120.94/155.81 = 155.81/x
  3. Step 3: Cross multiply
    120.94x = 155.81 × 155.81
  4. Step 4: Simplify right side
    120.94x = 24,277.54
  5. Step 5: Solve for x
    x = 24,277.54/120.94
  6. Step 6: Final answer
    x = 200.74

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.