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Finding the Fourth Proportional to 1,912.37, 2,868.75 and 679.89

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Solution

The fourth proportional to 1,912.37, 2,868.75 and 679.89 is: 1,019.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.37 : 2,868.75 = 679.89 : x
  2. Step 2: Convert to fraction form
    1,912.37/2,868.75 = 679.89/x
  3. Step 3: Cross multiply
    1,912.37x = 2,868.75 × 679.89
  4. Step 4: Simplify right side
    1,912.37x = 1,950,434.44
  5. Step 5: Solve for x
    x = 1,950,434.44/1,912.37
  6. Step 6: Final answer
    x = 1,019.91

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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.