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Finding the Fourth Proportional to 20,696.40, 31,044.60 and 20,120.40

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Solution

The fourth proportional to 20,696.40, 31,044.60 and 20,120.40 is: 30,180.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,696.40 : 31,044.60 = 20,120.40 : x
  2. Step 2: Convert to fraction form
    20,696.40/31,044.60 = 20,120.40/x
  3. Step 3: Cross multiply
    20,696.40x = 31,044.60 × 20,120.40
  4. Step 4: Simplify right side
    20,696.40x = 624,629,769.84
  5. Step 5: Solve for x
    x = 624,629,769.84/20,696.40
  6. Step 6: Final answer
    x = 30,180.60

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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.