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Finding the Third Proportional to 256,640 and 558,434

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Solution

The third proportional to 256,640 and 558,434 is: 1,215,120.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,640 : 558,434 = 558,434 : x
  2. Step 2: Convert to fraction form
    256,640/558,434 = 558,434/x
  3. Step 3: Cross multiply
    256,640x = 558,434 × 558,434
  4. Step 4: Simplify right side
    256,640x = 311,848,532,356
  5. Step 5: Solve for x
    x = 311,848,532,356/256,640
  6. Step 6: Final answer
    x = 1,215,120.53

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.