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Finding the Fourth Proportional to 20,912.94, 28,859.39 and 11,959.91

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Solution

The fourth proportional to 20,912.94, 28,859.39 and 11,959.91 is: 16,504.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.94 : 28,859.39 = 11,959.91 : x
  2. Step 2: Convert to fraction form
    20,912.94/28,859.39 = 11,959.91/x
  3. Step 3: Cross multiply
    20,912.94x = 28,859.39 × 11,959.91
  4. Step 4: Simplify right side
    20,912.94x = 345,155,719.40
  5. Step 5: Solve for x
    x = 345,155,719.40/20,912.94
  6. Step 6: Final answer
    x = 16,504.41

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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.