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Finding the Fourth Proportional to 12,940.80, 19,411.20 and 8,793.60

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Solution

The fourth proportional to 12,940.80, 19,411.20 and 8,793.60 is: 13,190.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,940.80 : 19,411.20 = 8,793.60 : x
  2. Step 2: Convert to fraction form
    12,940.80/19,411.20 = 8,793.60/x
  3. Step 3: Cross multiply
    12,940.80x = 19,411.20 × 8,793.60
  4. Step 4: Simplify right side
    12,940.80x = 170,694,328.32
  5. Step 5: Solve for x
    x = 170,694,328.32/12,940.80
  6. Step 6: Final answer
    x = 13,190.40

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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.