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Finding the Fourth Proportional to 6,421.68, 8,859.11 and 3,767.90

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Solution

The fourth proportional to 6,421.68, 8,859.11 and 3,767.90 is: 5,198.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,421.68 : 8,859.11 = 3,767.90 : x
  2. Step 2: Convert to fraction form
    6,421.68/8,859.11 = 3,767.90/x
  3. Step 3: Cross multiply
    6,421.68x = 8,859.11 × 3,767.90
  4. Step 4: Simplify right side
    6,421.68x = 33,380,177.43
  5. Step 5: Solve for x
    x = 33,380,177.43/6,421.68
  6. Step 6: Final answer
    x = 5,198.04

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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.