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Finding the Third Proportional to 128,655 and 279,315

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Solution

The third proportional to 128,655 and 279,315 is: 606,403.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,655 : 279,315 = 279,315 : x
  2. Step 2: Convert to fraction form
    128,655/279,315 = 279,315/x
  3. Step 3: Cross multiply
    128,655x = 279,315 × 279,315
  4. Step 4: Simplify right side
    128,655x = 78,016,869,225
  5. Step 5: Solve for x
    x = 78,016,869,225/128,655
  6. Step 6: Final answer
    x = 606,403.71

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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.