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Finding the Third Proportional to 66,936 and 139,421

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Solution

The third proportional to 66,936 and 139,421 is: 290,400.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,936 : 139,421 = 139,421 : x
  2. Step 2: Convert to fraction form
    66,936/139,421 = 139,421/x
  3. Step 3: Cross multiply
    66,936x = 139,421 × 139,421
  4. Step 4: Simplify right side
    66,936x = 19,438,215,241
  5. Step 5: Solve for x
    x = 19,438,215,241/66,936
  6. Step 6: Final answer
    x = 290,400.01

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.