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Finding the Third Proportional to 128 and 282

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Solution

The third proportional to 128 and 282 is: 621.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 282 = 282 : x
  2. Step 2: Convert to fraction form
    128/282 = 282/x
  3. Step 3: Cross multiply
    128x = 282 × 282
  4. Step 4: Simplify right side
    128x = 79,524
  5. Step 5: Solve for x
    x = 79,524/128
  6. Step 6: Final answer
    x = 621.28

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.