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Finding the Fourth Proportional to 13,410.40, 20,119.20 and 11,959.60

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Solution

The fourth proportional to 13,410.40, 20,119.20 and 11,959.60 is: 17,942.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,410.40 : 20,119.20 = 11,959.60 : x
  2. Step 2: Convert to fraction form
    13,410.40/20,119.20 = 11,959.60/x
  3. Step 3: Cross multiply
    13,410.40x = 20,119.20 × 11,959.60
  4. Step 4: Simplify right side
    13,410.40x = 240,617,584.32
  5. Step 5: Solve for x
    x = 240,617,584.32/13,410.40
  6. Step 6: Final answer
    x = 17,942.61

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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.