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Finding the Fourth Proportional to 20,461.01, 28,231.96 and 11,961.49

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Solution

The fourth proportional to 20,461.01, 28,231.96 and 11,961.49 is: 16,504.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,461.01 : 28,231.96 = 11,961.49 : x
  2. Step 2: Convert to fraction form
    20,461.01/28,231.96 = 11,961.49/x
  3. Step 3: Cross multiply
    20,461.01x = 28,231.96 × 11,961.49
  4. Step 4: Simplify right side
    20,461.01x = 337,696,247.41
  5. Step 5: Solve for x
    x = 337,696,247.41/20,461.01
  6. Step 6: Final answer
    x = 16,504.38

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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.