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Finding the Third Proportional to 311.13 and 662.88

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Solution

The third proportional to 311.13 and 662.88 is: 1,412.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.13 : 662.88 = 662.88 : x
  2. Step 2: Convert to fraction form
    311.13/662.88 = 662.88/x
  3. Step 3: Cross multiply
    311.13x = 662.88 × 662.88
  4. Step 4: Simplify right side
    311.13x = 439,403.27
  5. Step 5: Solve for x
    x = 439,403.27/311.13
  6. Step 6: Final answer
    x = 1,412.30

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.