Home / 1,912.31-2,868.58-679.86

Finding the Fourth Proportional to 1,912.31, 2,868.58 and 679.86

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Solution

The fourth proportional to 1,912.31, 2,868.58 and 679.86 is: 1,019.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.31 : 2,868.58 = 679.86 : x
  2. Step 2: Convert to fraction form
    1,912.31/2,868.58 = 679.86/x
  3. Step 3: Cross multiply
    1,912.31x = 2,868.58 × 679.86
  4. Step 4: Simplify right side
    1,912.31x = 1,950,233.65
  5. Step 5: Solve for x
    x = 1,950,233.65/1,912.31
  6. Step 6: Final answer
    x = 1,019.83

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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.