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Finding the Third Proportional to 127 and 138.25

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Solution

The third proportional to 127 and 138.25 is: 150.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    127 : 138.25 = 138.25 : x
  2. Step 2: Convert to fraction form
    127/138.25 = 138.25/x
  3. Step 3: Cross multiply
    127x = 138.25 × 138.25
  4. Step 4: Simplify right side
    127x = 19,113.06
  5. Step 5: Solve for x
    x = 19,113.06/127
  6. Step 6: Final answer
    x = 150.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.