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Finding the Third Proportional to 398.63 and 613.88

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Solution

The third proportional to 398.63 and 613.88 is: 945.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.63 : 613.88 = 613.88 : x
  2. Step 2: Convert to fraction form
    398.63/613.88 = 613.88/x
  3. Step 3: Cross multiply
    398.63x = 613.88 × 613.88
  4. Step 4: Simplify right side
    398.63x = 376,842.52
  5. Step 5: Solve for x
    x = 376,842.52/398.63
  6. Step 6: Final answer
    x = 945.36

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.