Home / 1,940.31-2,679.21-1,278.45

Finding the Fourth Proportional to 1,940.31, 2,679.21 and 1,278.45

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Solution

The fourth proportional to 1,940.31, 2,679.21 and 1,278.45 is: 1,765.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.31 : 2,679.21 = 1,278.45 : x
  2. Step 2: Convert to fraction form
    1,940.31/2,679.21 = 1,278.45/x
  3. Step 3: Cross multiply
    1,940.31x = 2,679.21 × 1,278.45
  4. Step 4: Simplify right side
    1,940.31x = 3,425,236.02
  5. Step 5: Solve for x
    x = 3,425,236.02/1,940.31
  6. Step 6: Final answer
    x = 1,765.30

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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.