Home / 20,960.40-31,440.60-12,212.40

Finding the Fourth Proportional to 20,960.40, 31,440.60 and 12,212.40

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Solution

The fourth proportional to 20,960.40, 31,440.60 and 12,212.40 is: 18,318.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,960.40 : 31,440.60 = 12,212.40 : x
  2. Step 2: Convert to fraction form
    20,960.40/31,440.60 = 12,212.40/x
  3. Step 3: Cross multiply
    20,960.40x = 31,440.60 × 12,212.40
  4. Step 4: Simplify right side
    20,960.40x = 383,965,183.44
  5. Step 5: Solve for x
    x = 383,965,183.44/20,960.40
  6. Step 6: Final answer
    x = 18,318.60

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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.