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Finding the Fourth Proportional to 20,628.71, 30,917.09 and 11,249.21

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Solution

The fourth proportional to 20,628.71, 30,917.09 and 11,249.21 is: 16,859.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,628.71 : 30,917.09 = 11,249.21 : x
  2. Step 2: Convert to fraction form
    20,628.71/30,917.09 = 11,249.21/x
  3. Step 3: Cross multiply
    20,628.71x = 30,917.09 × 11,249.21
  4. Step 4: Simplify right side
    20,628.71x = 347,792,627.17
  5. Step 5: Solve for x
    x = 347,792,627.17/20,628.71
  6. Step 6: Final answer
    x = 16,859.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.