Home / 20,405.40-28,161.33-11,906.88

Finding the Fourth Proportional to 20,405.40, 28,161.33 and 11,906.88

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Solution

The fourth proportional to 20,405.40, 28,161.33 and 11,906.88 is: 16,432.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.40 : 28,161.33 = 11,906.88 : x
  2. Step 2: Convert to fraction form
    20,405.40/28,161.33 = 11,906.88/x
  3. Step 3: Cross multiply
    20,405.40x = 28,161.33 × 11,906.88
  4. Step 4: Simplify right side
    20,405.40x = 335,313,576.95
  5. Step 5: Solve for x
    x = 335,313,576.95/20,405.40
  6. Step 6: Final answer
    x = 16,432.59

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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.