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Finding the Fourth Proportional to 12,961.60, 19,420.80 and 8,576.80

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Solution

The fourth proportional to 12,961.60, 19,420.80 and 8,576.80 is: 12,850.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,961.60 : 19,420.80 = 8,576.80 : x
  2. Step 2: Convert to fraction form
    12,961.60/19,420.80 = 8,576.80/x
  3. Step 3: Cross multiply
    12,961.60x = 19,420.80 × 8,576.80
  4. Step 4: Simplify right side
    12,961.60x = 166,568,317.44
  5. Step 5: Solve for x
    x = 166,568,317.44/12,961.60
  6. Step 6: Final answer
    x = 12,850.91

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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.