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Finding the Fourth Proportional to 21,144.78, 29,183.22 and 12,190.68

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Solution

The fourth proportional to 21,144.78, 29,183.22 and 12,190.68 is: 16,825.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,144.78 : 29,183.22 = 12,190.68 : x
  2. Step 2: Convert to fraction form
    21,144.78/29,183.22 = 12,190.68/x
  3. Step 3: Cross multiply
    21,144.78x = 29,183.22 × 12,190.68
  4. Step 4: Simplify right side
    21,144.78x = 355,763,296.39
  5. Step 5: Solve for x
    x = 355,763,296.39/21,144.78
  6. Step 6: Final answer
    x = 16,825.11

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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.