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Finding the Third Proportional to 139.75 and 236.88

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Solution

The third proportional to 139.75 and 236.88 is: 401.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.75 : 236.88 = 236.88 : x
  2. Step 2: Convert to fraction form
    139.75/236.88 = 236.88/x
  3. Step 3: Cross multiply
    139.75x = 236.88 × 236.88
  4. Step 4: Simplify right side
    139.75x = 56,109.77
  5. Step 5: Solve for x
    x = 56,109.77/139.75
  6. Step 6: Final answer
    x = 401.50

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Why These Related Problems?

These problems maintain the same ratio (1.69) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.