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Finding the Fourth Proportional to 47,286.60, 70,940.44 and 20,636.90

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Solution

The fourth proportional to 47,286.60, 70,940.44 and 20,636.90 is: 30,959.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,286.60 : 70,940.44 = 20,636.90 : x
  2. Step 2: Convert to fraction form
    47,286.60/70,940.44 = 20,636.90/x
  3. Step 3: Cross multiply
    47,286.60x = 70,940.44 × 20,636.90
  4. Step 4: Simplify right side
    47,286.60x = 1,463,990,766.24
  5. Step 5: Solve for x
    x = 1,463,990,766.24/47,286.60
  6. Step 6: Final answer
    x = 30,959.95

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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.