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Finding the Fourth Proportional to 19,629.20, 29,443.80 and 13,408.40

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Solution

The fourth proportional to 19,629.20, 29,443.80 and 13,408.40 is: 20,112.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,629.20 : 29,443.80 = 13,408.40 : x
  2. Step 2: Convert to fraction form
    19,629.20/29,443.80 = 13,408.40/x
  3. Step 3: Cross multiply
    19,629.20x = 29,443.80 × 13,408.40
  4. Step 4: Simplify right side
    19,629.20x = 394,794,247.92
  5. Step 5: Solve for x
    x = 394,794,247.92/19,629.20
  6. Step 6: Final answer
    x = 20,112.60

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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.