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Finding the Fourth Proportional to 6,391.89, 8,821.44 and 3,739.14

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Solution

The fourth proportional to 6,391.89, 8,821.44 and 3,739.14 is: 5,160.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,391.89 : 8,821.44 = 3,739.14 : x
  2. Step 2: Convert to fraction form
    6,391.89/8,821.44 = 3,739.14/x
  3. Step 3: Cross multiply
    6,391.89x = 8,821.44 × 3,739.14
  4. Step 4: Simplify right side
    6,391.89x = 32,984,599.16
  5. Step 5: Solve for x
    x = 32,984,599.16/6,391.89
  6. Step 6: Final answer
    x = 5,160.38

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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.