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Finding the Fourth Proportional to 138,640.40, 207,960.60 and 49,896.80

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Solution

The fourth proportional to 138,640.40, 207,960.60 and 49,896.80 is: 74,845.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,640.40 : 207,960.60 = 49,896.80 : x
  2. Step 2: Convert to fraction form
    138,640.40/207,960.60 = 49,896.80/x
  3. Step 3: Cross multiply
    138,640.40x = 207,960.60 × 49,896.80
  4. Step 4: Simplify right side
    138,640.40x = 10,376,568,466.08
  5. Step 5: Solve for x
    x = 10,376,568,466.08/138,640.40
  6. Step 6: Final answer
    x = 74,845.20

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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.