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Finding the Third Proportional to 99,711 and 210,678

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Solution

The third proportional to 99,711 and 210,678 is: 445,138.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,711 : 210,678 = 210,678 : x
  2. Step 2: Convert to fraction form
    99,711/210,678 = 210,678/x
  3. Step 3: Cross multiply
    99,711x = 210,678 × 210,678
  4. Step 4: Simplify right side
    99,711x = 44,385,219,684
  5. Step 5: Solve for x
    x = 44,385,219,684/99,711
  6. Step 6: Final answer
    x = 445,138.65

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.