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Finding the Fourth Proportional to 6,391.64, 8,821.78 and 3,739.70

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Solution

The fourth proportional to 6,391.64, 8,821.78 and 3,739.70 is: 5,161.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,391.64 : 8,821.78 = 3,739.70 : x
  2. Step 2: Convert to fraction form
    6,391.64/8,821.78 = 3,739.70/x
  3. Step 3: Cross multiply
    6,391.64x = 8,821.78 × 3,739.70
  4. Step 4: Simplify right side
    6,391.64x = 32,990,823.37
  5. Step 5: Solve for x
    x = 32,990,823.37/6,391.64
  6. Step 6: Final answer
    x = 5,161.56

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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.