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Finding the Third Proportional to 311.38 and 436.63

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Solution

The third proportional to 311.38 and 436.63 is: 612.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.38 : 436.63 = 436.63 : x
  2. Step 2: Convert to fraction form
    311.38/436.63 = 436.63/x
  3. Step 3: Cross multiply
    311.38x = 436.63 × 436.63
  4. Step 4: Simplify right side
    311.38x = 190,641.39
  5. Step 5: Solve for x
    x = 190,641.39/311.38
  6. Step 6: Final answer
    x = 612.26

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.