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Finding the Third Proportional to 189 and 400.78

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Solution

The third proportional to 189 and 400.78 is: 849.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    189 : 400.78 = 400.78 : x
  2. Step 2: Convert to fraction form
    189/400.78 = 400.78/x
  3. Step 3: Cross multiply
    189x = 400.78 × 400.78
  4. Step 4: Simplify right side
    189x = 160,625.61
  5. Step 5: Solve for x
    x = 160,625.61/189
  6. Step 6: Final answer
    x = 849.87

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.