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Finding the Third Proportional to 398 and 646

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Solution

The third proportional to 398 and 646 is: 1,048.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    398 : 646 = 646 : x
  2. Step 2: Convert to fraction form
    398/646 = 646/x
  3. Step 3: Cross multiply
    398x = 646 × 646
  4. Step 4: Simplify right side
    398x = 417,316
  5. Step 5: Solve for x
    x = 417,316/398
  6. Step 6: Final answer
    x = 1,048.53

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These problems maintain the same ratio (1.62) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.