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Finding the Fourth Proportional to 12,940.40, 19,410.60 and 10,121.60

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Solution

The fourth proportional to 12,940.40, 19,410.60 and 10,121.60 is: 15,182.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,940.40 : 19,410.60 = 10,121.60 : x
  2. Step 2: Convert to fraction form
    12,940.40/19,410.60 = 10,121.60/x
  3. Step 3: Cross multiply
    12,940.40x = 19,410.60 × 10,121.60
  4. Step 4: Simplify right side
    12,940.40x = 196,466,328.96
  5. Step 5: Solve for x
    x = 196,466,328.96/12,940.40
  6. Step 6: Final answer
    x = 15,182.40

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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.