Home / 3,131.78-4,322.31-1,805.22

Finding the Fourth Proportional to 3,131.78, 4,322.31 and 1,805.22

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Solution

The fourth proportional to 3,131.78, 4,322.31 and 1,805.22 is: 2,491.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.78 : 4,322.31 = 1,805.22 : x
  2. Step 2: Convert to fraction form
    3,131.78/4,322.31 = 1,805.22/x
  3. Step 3: Cross multiply
    3,131.78x = 4,322.31 × 1,805.22
  4. Step 4: Simplify right side
    3,131.78x = 7,802,720.46
  5. Step 5: Solve for x
    x = 7,802,720.46/3,131.78
  6. Step 6: Final answer
    x = 2,491.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.