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Finding the Fourth Proportional to 20,728.80, 31,129.65 and 20,072.70

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Solution

The fourth proportional to 20,728.80, 31,129.65 and 20,072.70 is: 30,144.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.80 : 31,129.65 = 20,072.70 : x
  2. Step 2: Convert to fraction form
    20,728.80/31,129.65 = 20,072.70/x
  3. Step 3: Cross multiply
    20,728.80x = 31,129.65 × 20,072.70
  4. Step 4: Simplify right side
    20,728.80x = 624,856,125.56
  5. Step 5: Solve for x
    x = 624,856,125.56/20,728.80
  6. Step 6: Final answer
    x = 30,144.35

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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.