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Finding the Third Proportional to 31,836 and 69,378

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Solution

The third proportional to 31,836 and 69,378 is: 151,190.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,836 : 69,378 = 69,378 : x
  2. Step 2: Convert to fraction form
    31,836/69,378 = 69,378/x
  3. Step 3: Cross multiply
    31,836x = 69,378 × 69,378
  4. Step 4: Simplify right side
    31,836x = 4,813,306,884
  5. Step 5: Solve for x
    x = 4,813,306,884/31,836
  6. Step 6: Final answer
    x = 151,190.69

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.