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Finding the Third Proportional to 394,290 and 557,911.50

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Solution

The third proportional to 394,290 and 557,911.50 is: 789,432.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,290 : 557,911.50 = 557,911.50 : x
  2. Step 2: Convert to fraction form
    394,290/557,911.50 = 557,911.50/x
  3. Step 3: Cross multiply
    394,290x = 557,911.50 × 557,911.50
  4. Step 4: Simplify right side
    394,290x = 311,265,241,832.25
  5. Step 5: Solve for x
    x = 311,265,241,832.25/394,290
  6. Step 6: Final answer
    x = 789,432.25

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.