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Finding the Third Proportional to 138.75 and 162

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Solution

The third proportional to 138.75 and 162 is: 189.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.75 : 162 = 162 : x
  2. Step 2: Convert to fraction form
    138.75/162 = 162/x
  3. Step 3: Cross multiply
    138.75x = 162 × 162
  4. Step 4: Simplify right side
    138.75x = 26,244
  5. Step 5: Solve for x
    x = 26,244/138.75
  6. Step 6: Final answer
    x = 189.15

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These problems maintain the same ratio (1.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.