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Finding the Fourth Proportional to 2,626.81, 3,940.21 and 678.86

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Solution

The fourth proportional to 2,626.81, 3,940.21 and 678.86 is: 1,018.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,626.81 : 3,940.21 = 678.86 : x
  2. Step 2: Convert to fraction form
    2,626.81/3,940.21 = 678.86/x
  3. Step 3: Cross multiply
    2,626.81x = 3,940.21 × 678.86
  4. Step 4: Simplify right side
    2,626.81x = 2,674,850.96
  5. Step 5: Solve for x
    x = 2,674,850.96/2,626.81
  6. Step 6: Final answer
    x = 1,018.29

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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.