Home / 1,912.20-2,868.60-679.98

Finding the Fourth Proportional to 1,912.20, 2,868.60 and 679.98

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Solution

The fourth proportional to 1,912.20, 2,868.60 and 679.98 is: 1,020.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.20 : 2,868.60 = 679.98 : x
  2. Step 2: Convert to fraction form
    1,912.20/2,868.60 = 679.98/x
  3. Step 3: Cross multiply
    1,912.20x = 2,868.60 × 679.98
  4. Step 4: Simplify right side
    1,912.20x = 1,950,590.63
  5. Step 5: Solve for x
    x = 1,950,590.63/1,912.20
  6. Step 6: Final answer
    x = 1,020.08

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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.