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Finding the Third Proportional to 399.38 and 856.41

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Solution

The third proportional to 399.38 and 856.41 is: 1,836.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.38 : 856.41 = 856.41 : x
  2. Step 2: Convert to fraction form
    399.38/856.41 = 856.41/x
  3. Step 3: Cross multiply
    399.38x = 856.41 × 856.41
  4. Step 4: Simplify right side
    399.38x = 733,431.67
  5. Step 5: Solve for x
    x = 733,431.67/399.38
  6. Step 6: Final answer
    x = 1,836.45

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.