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Finding the Fourth Proportional to 1,912.10, 2,868.21 and 679.49

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Solution

The fourth proportional to 1,912.10, 2,868.21 and 679.49 is: 1,019.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.10 : 2,868.21 = 679.49 : x
  2. Step 2: Convert to fraction form
    1,912.10/2,868.21 = 679.49/x
  3. Step 3: Cross multiply
    1,912.10x = 2,868.21 × 679.49
  4. Step 4: Simplify right side
    1,912.10x = 1,948,920.01
  5. Step 5: Solve for x
    x = 1,948,920.01/1,912.10
  6. Step 6: Final answer
    x = 1,019.26

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1.5x scale

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.