Home / 20,857.26-28,785.78-11,902.70

Finding the Fourth Proportional to 20,857.26, 28,785.78 and 11,902.70

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Solution

The fourth proportional to 20,857.26, 28,785.78 and 11,902.70 is: 16,427.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.26 : 28,785.78 = 11,902.70 : x
  2. Step 2: Convert to fraction form
    20,857.26/28,785.78 = 11,902.70/x
  3. Step 3: Cross multiply
    20,857.26x = 28,785.78 × 11,902.70
  4. Step 4: Simplify right side
    20,857.26x = 342,628,503.61
  5. Step 5: Solve for x
    x = 342,628,503.61/20,857.26
  6. Step 6: Final answer
    x = 16,427.30

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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.