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Finding the Fourth Proportional to 6,388.47, 8,820.90 and 6,286.41

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Solution

The fourth proportional to 6,388.47, 8,820.90 and 6,286.41 is: 8,679.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,388.47 : 8,820.90 = 6,286.41 : x
  2. Step 2: Convert to fraction form
    6,388.47/8,820.90 = 6,286.41/x
  3. Step 3: Cross multiply
    6,388.47x = 8,820.90 × 6,286.41
  4. Step 4: Simplify right side
    6,388.47x = 55,451,793.97
  5. Step 5: Solve for x
    x = 55,451,793.97/6,388.47
  6. Step 6: Final answer
    x = 8,679.98

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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.