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Finding the Fourth Proportional to 2,608.02, 3,912.64 and 853.11

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Solution

The fourth proportional to 2,608.02, 3,912.64 and 853.11 is: 1,279.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,608.02 : 3,912.64 = 853.11 : x
  2. Step 2: Convert to fraction form
    2,608.02/3,912.64 = 853.11/x
  3. Step 3: Cross multiply
    2,608.02x = 3,912.64 × 853.11
  4. Step 4: Simplify right side
    2,608.02x = 3,337,910.18
  5. Step 5: Solve for x
    x = 3,337,910.18/2,608.02
  6. Step 6: Final answer
    x = 1,279.86

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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.