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Finding the Third Proportional to 256,428 and 398,079

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Solution

The third proportional to 256,428 and 398,079 is: 617,978.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,428 : 398,079 = 398,079 : x
  2. Step 2: Convert to fraction form
    256,428/398,079 = 398,079/x
  3. Step 3: Cross multiply
    256,428x = 398,079 × 398,079
  4. Step 4: Simplify right side
    256,428x = 158,466,890,241
  5. Step 5: Solve for x
    x = 158,466,890,241/256,428
  6. Step 6: Final answer
    x = 617,978.11

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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.