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Finding the Third Proportional to 128 and 261.25

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Solution

The third proportional to 128 and 261.25 is: 533.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 261.25 = 261.25 : x
  2. Step 2: Convert to fraction form
    128/261.25 = 261.25/x
  3. Step 3: Cross multiply
    128x = 261.25 × 261.25
  4. Step 4: Simplify right side
    128x = 68,251.56
  5. Step 5: Solve for x
    x = 68,251.56/128
  6. Step 6: Final answer
    x = 533.22

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Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.