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Finding the Fourth Proportional to 1,912.16, 2,868.66 and 679.64

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Solution

The fourth proportional to 1,912.16, 2,868.66 and 679.64 is: 1,019.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.16 : 2,868.66 = 679.64 : x
  2. Step 2: Convert to fraction form
    1,912.16/2,868.66 = 679.64/x
  3. Step 3: Cross multiply
    1,912.16x = 2,868.66 × 679.64
  4. Step 4: Simplify right side
    1,912.16x = 1,949,656.08
  5. Step 5: Solve for x
    x = 1,949,656.08/1,912.16
  6. Step 6: Final answer
    x = 1,019.61

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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.