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Finding the Fourth Proportional to 20,648.21, 30,986.90 and 8,168.66

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Solution

The fourth proportional to 20,648.21, 30,986.90 and 8,168.66 is: 12,258.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,648.21 : 30,986.90 = 8,168.66 : x
  2. Step 2: Convert to fraction form
    20,648.21/30,986.90 = 8,168.66/x
  3. Step 3: Cross multiply
    20,648.21x = 30,986.90 × 8,168.66
  4. Step 4: Simplify right side
    20,648.21x = 253,121,254.78
  5. Step 5: Solve for x
    x = 253,121,254.78/20,648.21
  6. Step 6: Final answer
    x = 12,258.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.