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Finding the Fourth Proportional to 20,856.76, 28,785.09 and 11,902.21

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Solution

The fourth proportional to 20,856.76, 28,785.09 and 11,902.21 is: 16,426.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.76 : 28,785.09 = 11,902.21 : x
  2. Step 2: Convert to fraction form
    20,856.76/28,785.09 = 11,902.21/x
  3. Step 3: Cross multiply
    20,856.76x = 28,785.09 × 11,902.21
  4. Step 4: Simplify right side
    20,856.76x = 342,606,186.05
  5. Step 5: Solve for x
    x = 342,606,186.05/20,856.76
  6. Step 6: Final answer
    x = 16,426.63

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Double scale
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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.