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Finding the Third Proportional to 180,400 and 391,543

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Solution

The third proportional to 180,400 and 391,543 is: 849,811.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    180,400 : 391,543 = 391,543 : x
  2. Step 2: Convert to fraction form
    180,400/391,543 = 391,543/x
  3. Step 3: Cross multiply
    180,400x = 391,543 × 391,543
  4. Step 4: Simplify right side
    180,400x = 153,305,920,849
  5. Step 5: Solve for x
    x = 153,305,920,849/180,400
  6. Step 6: Final answer
    x = 849,811.09

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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.