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Finding the Third Proportional to 143,778 and 311,990

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Solution

The third proportional to 143,778 and 311,990 is: 677,000.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,778 : 311,990 = 311,990 : x
  2. Step 2: Convert to fraction form
    143,778/311,990 = 311,990/x
  3. Step 3: Cross multiply
    143,778x = 311,990 × 311,990
  4. Step 4: Simplify right side
    143,778x = 97,337,760,100
  5. Step 5: Solve for x
    x = 97,337,760,100/143,778
  6. Step 6: Final answer
    x = 677,000.38

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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.