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Finding the Third Proportional to 128 and 178

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Solution

The third proportional to 128 and 178 is: 247.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 178 = 178 : x
  2. Step 2: Convert to fraction form
    128/178 = 178/x
  3. Step 3: Cross multiply
    128x = 178 × 178
  4. Step 4: Simplify right side
    128x = 31,684
  5. Step 5: Solve for x
    x = 31,684/128
  6. Step 6: Final answer
    x = 247.53

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.