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Finding the Fourth Proportional to 20,940.54, 28,898.82 and 11,986.80

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Solution

The fourth proportional to 20,940.54, 28,898.82 and 11,986.80 is: 16,542.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.54 : 28,898.82 = 11,986.80 : x
  2. Step 2: Convert to fraction form
    20,940.54/28,898.82 = 11,986.80/x
  3. Step 3: Cross multiply
    20,940.54x = 28,898.82 × 11,986.80
  4. Step 4: Simplify right side
    20,940.54x = 346,404,375.58
  5. Step 5: Solve for x
    x = 346,404,375.58/20,940.54
  6. Step 6: Final answer
    x = 16,542.28

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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.