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Finding the Third Proportional to 390.94 and 696.38

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Solution

The third proportional to 390.94 and 696.38 is: 1,240.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.94 : 696.38 = 696.38 : x
  2. Step 2: Convert to fraction form
    390.94/696.38 = 696.38/x
  3. Step 3: Cross multiply
    390.94x = 696.38 × 696.38
  4. Step 4: Simplify right side
    390.94x = 484,938.14
  5. Step 5: Solve for x
    x = 484,938.14/390.94
  6. Step 6: Final answer
    x = 1,240.45

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.