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Finding the Third Proportional to 91,290 and 197,991

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Solution

The third proportional to 91,290 and 197,991 is: 429,405.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,290 : 197,991 = 197,991 : x
  2. Step 2: Convert to fraction form
    91,290/197,991 = 197,991/x
  3. Step 3: Cross multiply
    91,290x = 197,991 × 197,991
  4. Step 4: Simplify right side
    91,290x = 39,200,436,081
  5. Step 5: Solve for x
    x = 39,200,436,081/91,290
  6. Step 6: Final answer
    x = 429,405.59

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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.