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Finding the Third Proportional to 30,699 and 66,122

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Solution

The third proportional to 30,699 and 66,122 is: 142,418.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,699 : 66,122 = 66,122 : x
  2. Step 2: Convert to fraction form
    30,699/66,122 = 66,122/x
  3. Step 3: Cross multiply
    30,699x = 66,122 × 66,122
  4. Step 4: Simplify right side
    30,699x = 4,372,118,884
  5. Step 5: Solve for x
    x = 4,372,118,884/30,699
  6. Step 6: Final answer
    x = 142,418.93

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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.