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Finding the Fourth Proportional to 879.36, 1,311.96 and 838.08

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Solution

The fourth proportional to 879.36, 1,311.96 and 838.08 is: 1,250.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.36 : 1,311.96 = 838.08 : x
  2. Step 2: Convert to fraction form
    879.36/1,311.96 = 838.08/x
  3. Step 3: Cross multiply
    879.36x = 1,311.96 × 838.08
  4. Step 4: Simplify right side
    879.36x = 1,099,527.44
  5. Step 5: Solve for x
    x = 1,099,527.44/879.36
  6. Step 6: Final answer
    x = 1,250.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.