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Finding the Third Proportional to 256,211 and 385,140

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Solution

The third proportional to 256,211 and 385,140 is: 578,947.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,211 : 385,140 = 385,140 : x
  2. Step 2: Convert to fraction form
    256,211/385,140 = 385,140/x
  3. Step 3: Cross multiply
    256,211x = 385,140 × 385,140
  4. Step 4: Simplify right side
    256,211x = 148,332,819,600
  5. Step 5: Solve for x
    x = 148,332,819,600/256,211
  6. Step 6: Final answer
    x = 578,947.90

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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.