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Finding the Fourth Proportional to 2,830.70, 3,906 and 1,571.55

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Solution

The fourth proportional to 2,830.70, 3,906 and 1,571.55 is: 2,168.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,830.70 : 3,906 = 1,571.55 : x
  2. Step 2: Convert to fraction form
    2,830.70/3,906 = 1,571.55/x
  3. Step 3: Cross multiply
    2,830.70x = 3,906 × 1,571.55
  4. Step 4: Simplify right side
    2,830.70x = 6,138,474.30
  5. Step 5: Solve for x
    x = 6,138,474.30/2,830.70
  6. Step 6: Final answer
    x = 2,168.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.