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Finding the Third Proportional to 311.63 and 658.13

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Solution

The third proportional to 311.63 and 658.13 is: 1,389.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.63 : 658.13 = 658.13 : x
  2. Step 2: Convert to fraction form
    311.63/658.13 = 658.13/x
  3. Step 3: Cross multiply
    311.63x = 658.13 × 658.13
  4. Step 4: Simplify right side
    311.63x = 433,128.52
  5. Step 5: Solve for x
    x = 433,128.52/311.63
  6. Step 6: Final answer
    x = 1,389.90

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.