Home / 3,131.12-4,696.62-939.70

Finding the Fourth Proportional to 3,131.12, 4,696.62 and 939.70

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Solution

The fourth proportional to 3,131.12, 4,696.62 and 939.70 is: 1,409.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.12 : 4,696.62 = 939.70 : x
  2. Step 2: Convert to fraction form
    3,131.12/4,696.62 = 939.70/x
  3. Step 3: Cross multiply
    3,131.12x = 4,696.62 × 939.70
  4. Step 4: Simplify right side
    3,131.12x = 4,413,416.16
  5. Step 5: Solve for x
    x = 4,413,416.16/3,131.12
  6. Step 6: Final answer
    x = 1,409.53

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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.