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Finding the Third Proportional to 128.50 and 239

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Solution

The third proportional to 128.50 and 239 is: 444.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.50 : 239 = 239 : x
  2. Step 2: Convert to fraction form
    128.50/239 = 239/x
  3. Step 3: Cross multiply
    128.50x = 239 × 239
  4. Step 4: Simplify right side
    128.50x = 57,121
  5. Step 5: Solve for x
    x = 57,121/128.50
  6. Step 6: Final answer
    x = 444.52

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.