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Finding the Fourth Proportional to 138,696.11, 207,919.28 and 49,887.19

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Solution

The fourth proportional to 138,696.11, 207,919.28 and 49,887.19 is: 74,785.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,696.11 : 207,919.28 = 49,887.19 : x
  2. Step 2: Convert to fraction form
    138,696.11/207,919.28 = 49,887.19/x
  3. Step 3: Cross multiply
    138,696.11x = 207,919.28 × 49,887.19
  4. Step 4: Simplify right side
    138,696.11x = 10,372,508,626.02
  5. Step 5: Solve for x
    x = 10,372,508,626.02/138,696.11
  6. Step 6: Final answer
    x = 74,785.87

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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.