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Finding the Third Proportional to 408.75 and 991.88

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Solution

The third proportional to 408.75 and 991.88 is: 2,406.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.75 : 991.88 = 991.88 : x
  2. Step 2: Convert to fraction form
    408.75/991.88 = 991.88/x
  3. Step 3: Cross multiply
    408.75x = 991.88 × 991.88
  4. Step 4: Simplify right side
    408.75x = 983,816.02
  5. Step 5: Solve for x
    x = 983,816.02/408.75
  6. Step 6: Final answer
    x = 2,406.89

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Why These Related Problems?

These problems maintain the same ratio (2.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.