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Finding the Third Proportional to 139,415 and 209,438

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Solution

The third proportional to 139,415 and 209,438 is: 314,630.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,415 : 209,438 = 209,438 : x
  2. Step 2: Convert to fraction form
    139,415/209,438 = 209,438/x
  3. Step 3: Cross multiply
    139,415x = 209,438 × 209,438
  4. Step 4: Simplify right side
    139,415x = 43,864,275,844
  5. Step 5: Solve for x
    x = 43,864,275,844/139,415
  6. Step 6: Final answer
    x = 314,630.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.