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Finding the Fourth Proportional to 20,391.98, 30,599.11 and 7,912.49

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Solution

The fourth proportional to 20,391.98, 30,599.11 and 7,912.49 is: 11,873.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.98 : 30,599.11 = 7,912.49 : x
  2. Step 2: Convert to fraction form
    20,391.98/30,599.11 = 7,912.49/x
  3. Step 3: Cross multiply
    20,391.98x = 30,599.11 × 7,912.49
  4. Step 4: Simplify right side
    20,391.98x = 242,115,093.85
  5. Step 5: Solve for x
    x = 242,115,093.85/20,391.98
  6. Step 6: Final answer
    x = 11,873.06

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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.