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Finding the Fourth Proportional to 5,912.78, 8,870.03 and 3,138.74

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Solution

The fourth proportional to 5,912.78, 8,870.03 and 3,138.74 is: 4,708.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,912.78 : 8,870.03 = 3,138.74 : x
  2. Step 2: Convert to fraction form
    5,912.78/8,870.03 = 3,138.74/x
  3. Step 3: Cross multiply
    5,912.78x = 8,870.03 × 3,138.74
  4. Step 4: Simplify right side
    5,912.78x = 27,840,717.96
  5. Step 5: Solve for x
    x = 27,840,717.96/5,912.78
  6. Step 6: Final answer
    x = 4,708.57

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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.