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Finding the Third Proportional to 311.91 and 659.95

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Solution

The third proportional to 311.91 and 659.95 is: 1,396.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.91 : 659.95 = 659.95 : x
  2. Step 2: Convert to fraction form
    311.91/659.95 = 659.95/x
  3. Step 3: Cross multiply
    311.91x = 659.95 × 659.95
  4. Step 4: Simplify right side
    311.91x = 435,538.13
  5. Step 5: Solve for x
    x = 435,538.13/311.91
  6. Step 6: Final answer
    x = 1,396.38

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.