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Finding the Fourth Proportional to 1,912.13, 2,867.22 and 679.34

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Solution

The fourth proportional to 1,912.13, 2,867.22 and 679.34 is: 1,018.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.13 : 2,867.22 = 679.34 : x
  2. Step 2: Convert to fraction form
    1,912.13/2,867.22 = 679.34/x
  3. Step 3: Cross multiply
    1,912.13x = 2,867.22 × 679.34
  4. Step 4: Simplify right side
    1,912.13x = 1,947,802.90
  5. Step 5: Solve for x
    x = 1,947,802.90/1,912.13
  6. Step 6: Final answer
    x = 1,018.66

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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.