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Finding the Fourth Proportional to 3,912.16, 5,869.15 and 1,138.89

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Solution

The fourth proportional to 3,912.16, 5,869.15 and 1,138.89 is: 1,708.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,912.16 : 5,869.15 = 1,138.89 : x
  2. Step 2: Convert to fraction form
    3,912.16/5,869.15 = 1,138.89/x
  3. Step 3: Cross multiply
    3,912.16x = 5,869.15 × 1,138.89
  4. Step 4: Simplify right side
    3,912.16x = 6,684,316.24
  5. Step 5: Solve for x
    x = 6,684,316.24/3,912.16
  6. Step 6: Final answer
    x = 1,708.60

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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.