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Finding the Third Proportional to 256,078 and 387,655

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Solution

The third proportional to 256,078 and 387,655 is: 586,838.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,078 : 387,655 = 387,655 : x
  2. Step 2: Convert to fraction form
    256,078/387,655 = 387,655/x
  3. Step 3: Cross multiply
    256,078x = 387,655 × 387,655
  4. Step 4: Simplify right side
    256,078x = 150,276,399,025
  5. Step 5: Solve for x
    x = 150,276,399,025/256,078
  6. Step 6: Final answer
    x = 586,838.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.