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Finding the Fourth Proportional to 20,650.78, 28,497.27 and 11,698.78

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Solution

The fourth proportional to 20,650.78, 28,497.27 and 11,698.78 is: 16,143.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,650.78 : 28,497.27 = 11,698.78 : x
  2. Step 2: Convert to fraction form
    20,650.78/28,497.27 = 11,698.78/x
  3. Step 3: Cross multiply
    20,650.78x = 28,497.27 × 11,698.78
  4. Step 4: Simplify right side
    20,650.78x = 333,383,292.33
  5. Step 5: Solve for x
    x = 333,383,292.33/20,650.78
  6. Step 6: Final answer
    x = 16,143.86

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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.