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Finding the Third Proportional to 101.81 and 120.38

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Solution

The third proportional to 101.81 and 120.38 is: 142.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.81 : 120.38 = 120.38 : x
  2. Step 2: Convert to fraction form
    101.81/120.38 = 120.38/x
  3. Step 3: Cross multiply
    101.81x = 120.38 × 120.38
  4. Step 4: Simplify right side
    101.81x = 14,490.14
  5. Step 5: Solve for x
    x = 14,490.14/101.81
  6. Step 6: Final answer
    x = 142.32

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.