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Finding the Third Proportional to 389.94 and 918.56

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Solution

The third proportional to 389.94 and 918.56 is: 2,163.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.94 : 918.56 = 918.56 : x
  2. Step 2: Convert to fraction form
    389.94/918.56 = 918.56/x
  3. Step 3: Cross multiply
    389.94x = 918.56 × 918.56
  4. Step 4: Simplify right side
    389.94x = 843,757.07
  5. Step 5: Solve for x
    x = 843,757.07/389.94
  6. Step 6: Final answer
    x = 2,163.83

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.