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Finding the Third Proportional to 398 and 692

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Solution

The third proportional to 398 and 692 is: 1,203.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    398 : 692 = 692 : x
  2. Step 2: Convert to fraction form
    398/692 = 692/x
  3. Step 3: Cross multiply
    398x = 692 × 692
  4. Step 4: Simplify right side
    398x = 478,864
  5. Step 5: Solve for x
    x = 478,864/398
  6. Step 6: Final answer
    x = 1,203.18

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These problems maintain the same ratio (1.74) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.