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Finding the Third Proportional to 138.75 and 156

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Solution

The third proportional to 138.75 and 156 is: 175.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.75 : 156 = 156 : x
  2. Step 2: Convert to fraction form
    138.75/156 = 156/x
  3. Step 3: Cross multiply
    138.75x = 156 × 156
  4. Step 4: Simplify right side
    138.75x = 24,336
  5. Step 5: Solve for x
    x = 24,336/138.75
  6. Step 6: Final answer
    x = 175.39

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Why These Related Problems?

These problems maintain the same ratio (1.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.