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Finding the Fourth Proportional to 20,872.68, 28,807.01 and 11,921.91

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Solution

The fourth proportional to 20,872.68, 28,807.01 and 11,921.91 is: 16,453.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.68 : 28,807.01 = 11,921.91 : x
  2. Step 2: Convert to fraction form
    20,872.68/28,807.01 = 11,921.91/x
  3. Step 3: Cross multiply
    20,872.68x = 28,807.01 × 11,921.91
  4. Step 4: Simplify right side
    20,872.68x = 343,434,580.59
  5. Step 5: Solve for x
    x = 343,434,580.59/20,872.68
  6. Step 6: Final answer
    x = 16,453.78

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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.