Home / 3,912.78-5,870.43-1,139.62

Finding the Fourth Proportional to 3,912.78, 5,870.43 and 1,139.62

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Solution

The fourth proportional to 3,912.78, 5,870.43 and 1,139.62 is: 1,709.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,912.78 : 5,870.43 = 1,139.62 : x
  2. Step 2: Convert to fraction form
    3,912.78/5,870.43 = 1,139.62/x
  3. Step 3: Cross multiply
    3,912.78x = 5,870.43 × 1,139.62
  4. Step 4: Simplify right side
    3,912.78x = 6,690,059.44
  5. Step 5: Solve for x
    x = 6,690,059.44/3,912.78
  6. Step 6: Final answer
    x = 1,709.80

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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.