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Finding the Fourth Proportional to 6,391.21, 8,819.68 and 3,558.44

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Solution

The fourth proportional to 6,391.21, 8,819.68 and 3,558.44 is: 4,910.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,391.21 : 8,819.68 = 3,558.44 : x
  2. Step 2: Convert to fraction form
    6,391.21/8,819.68 = 3,558.44/x
  3. Step 3: Cross multiply
    6,391.21x = 8,819.68 × 3,558.44
  4. Step 4: Simplify right side
    6,391.21x = 31,384,302.10
  5. Step 5: Solve for x
    x = 31,384,302.10/6,391.21
  6. Step 6: Final answer
    x = 4,910.54

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1.5x scale

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.