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Finding the Third Proportional to 143.72 and 311.77

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Solution

The third proportional to 143.72 and 311.77 is: 676.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.72 : 311.77 = 311.77 : x
  2. Step 2: Convert to fraction form
    143.72/311.77 = 311.77/x
  3. Step 3: Cross multiply
    143.72x = 311.77 × 311.77
  4. Step 4: Simplify right side
    143.72x = 97,197.80
  5. Step 5: Solve for x
    x = 97,197.80/143.72
  6. Step 6: Final answer
    x = 676.31

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.