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Finding the Third Proportional to 393.75 and 838.38

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Solution

The third proportional to 393.75 and 838.38 is: 1,785.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.75 : 838.38 = 838.38 : x
  2. Step 2: Convert to fraction form
    393.75/838.38 = 838.38/x
  3. Step 3: Cross multiply
    393.75x = 838.38 × 838.38
  4. Step 4: Simplify right side
    393.75x = 702,872.64
  5. Step 5: Solve for x
    x = 702,872.64/393.75
  6. Step 6: Final answer
    x = 1,785.07

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.