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Finding the Third Proportional to 64,990 and 139,652

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Solution

The third proportional to 64,990 and 139,652 is: 300,087.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,990 : 139,652 = 139,652 : x
  2. Step 2: Convert to fraction form
    64,990/139,652 = 139,652/x
  3. Step 3: Cross multiply
    64,990x = 139,652 × 139,652
  4. Step 4: Simplify right side
    64,990x = 19,502,681,104
  5. Step 5: Solve for x
    x = 19,502,681,104/64,990
  6. Step 6: Final answer
    x = 300,087.42

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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.