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Finding the Third Proportional to 256,209 and 385,134

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Solution

The third proportional to 256,209 and 385,134 is: 578,934.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,209 : 385,134 = 385,134 : x
  2. Step 2: Convert to fraction form
    256,209/385,134 = 385,134/x
  3. Step 3: Cross multiply
    256,209x = 385,134 × 385,134
  4. Step 4: Simplify right side
    256,209x = 148,328,197,956
  5. Step 5: Solve for x
    x = 148,328,197,956/256,209
  6. Step 6: Final answer
    x = 578,934.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.