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Finding the Third Proportional to 189.84 and 408.66

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Solution

The third proportional to 189.84 and 408.66 is: 879.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.84 : 408.66 = 408.66 : x
  2. Step 2: Convert to fraction form
    189.84/408.66 = 408.66/x
  3. Step 3: Cross multiply
    189.84x = 408.66 × 408.66
  4. Step 4: Simplify right side
    189.84x = 166,999.93
  5. Step 5: Solve for x
    x = 166,999.93/189.84
  6. Step 6: Final answer
    x = 879.67

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.