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Finding the Third Proportional to 398.95 and 619.31

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Solution

The third proportional to 398.95 and 619.31 is: 961.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.95 : 619.31 = 619.31 : x
  2. Step 2: Convert to fraction form
    398.95/619.31 = 619.31/x
  3. Step 3: Cross multiply
    398.95x = 619.31 × 619.31
  4. Step 4: Simplify right side
    398.95x = 383,547.97
  5. Step 5: Solve for x
    x = 383,547.97/398.95
  6. Step 6: Final answer
    x = 961.39

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.