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Finding the Third Proportional to 30,786 and 66,279

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Solution

The third proportional to 30,786 and 66,279 is: 142,691.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,786 : 66,279 = 66,279 : x
  2. Step 2: Convert to fraction form
    30,786/66,279 = 66,279/x
  3. Step 3: Cross multiply
    30,786x = 66,279 × 66,279
  4. Step 4: Simplify right side
    30,786x = 4,392,905,841
  5. Step 5: Solve for x
    x = 4,392,905,841/30,786
  6. Step 6: Final answer
    x = 142,691.67

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.