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Finding the Third Proportional to 139,406 and 210,837

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Solution

The third proportional to 139,406 and 210,837 is: 318,868.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,406 : 210,837 = 210,837 : x
  2. Step 2: Convert to fraction form
    139,406/210,837 = 210,837/x
  3. Step 3: Cross multiply
    139,406x = 210,837 × 210,837
  4. Step 4: Simplify right side
    139,406x = 44,452,240,569
  5. Step 5: Solve for x
    x = 44,452,240,569/139,406
  6. Step 6: Final answer
    x = 318,868.92

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.