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Finding the Fourth Proportional to 20,940.88, 28,898.41 and 11,509.44

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Solution

The fourth proportional to 20,940.88, 28,898.41 and 11,509.44 is: 15,883.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.88 : 28,898.41 = 11,509.44 : x
  2. Step 2: Convert to fraction form
    20,940.88/28,898.41 = 11,509.44/x
  3. Step 3: Cross multiply
    20,940.88x = 28,898.41 × 11,509.44
  4. Step 4: Simplify right side
    20,940.88x = 332,604,515.99
  5. Step 5: Solve for x
    x = 332,604,515.99/20,940.88
  6. Step 6: Final answer
    x = 15,883.03

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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.