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Finding the Third Proportional to 99,920 and 210,992

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Solution

The third proportional to 99,920 and 210,992 is: 445,532.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,920 : 210,992 = 210,992 : x
  2. Step 2: Convert to fraction form
    99,920/210,992 = 210,992/x
  3. Step 3: Cross multiply
    99,920x = 210,992 × 210,992
  4. Step 4: Simplify right side
    99,920x = 44,517,624,064
  5. Step 5: Solve for x
    x = 44,517,624,064/99,920
  6. Step 6: Final answer
    x = 445,532.67

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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.