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Finding the Third Proportional to 256,410 and 398,054

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Solution

The third proportional to 256,410 and 398,054 is: 617,943.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,410 : 398,054 = 398,054 : x
  2. Step 2: Convert to fraction form
    256,410/398,054 = 398,054/x
  3. Step 3: Cross multiply
    256,410x = 398,054 × 398,054
  4. Step 4: Simplify right side
    256,410x = 158,446,986,916
  5. Step 5: Solve for x
    x = 158,446,986,916/256,410
  6. Step 6: Final answer
    x = 617,943.87

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.