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Finding the Fourth Proportional to 3,131.31, 4,696.97 and 939.81

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Solution

The fourth proportional to 3,131.31, 4,696.97 and 939.81 is: 1,409.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.31 : 4,696.97 = 939.81 : x
  2. Step 2: Convert to fraction form
    3,131.31/4,696.97 = 939.81/x
  3. Step 3: Cross multiply
    3,131.31x = 4,696.97 × 939.81
  4. Step 4: Simplify right side
    3,131.31x = 4,414,254.68
  5. Step 5: Solve for x
    x = 4,414,254.68/3,131.31
  6. Step 6: Final answer
    x = 1,409.72

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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.