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Finding the Third Proportional to 256.44 and 557.69

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Solution

The third proportional to 256.44 and 557.69 is: 1,212.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.44 : 557.69 = 557.69 : x
  2. Step 2: Convert to fraction form
    256.44/557.69 = 557.69/x
  3. Step 3: Cross multiply
    256.44x = 557.69 × 557.69
  4. Step 4: Simplify right side
    256.44x = 311,015.35
  5. Step 5: Solve for x
    x = 311,015.35/256.44
  6. Step 6: Final answer
    x = 1,212.83

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.