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Finding the Fourth Proportional to 20,469.57, 30,690.74 and 7,990.76

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Solution

The fourth proportional to 20,469.57, 30,690.74 and 7,990.76 is: 11,980.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,469.57 : 30,690.74 = 7,990.76 : x
  2. Step 2: Convert to fraction form
    20,469.57/30,690.74 = 7,990.76/x
  3. Step 3: Cross multiply
    20,469.57x = 30,690.74 × 7,990.76
  4. Step 4: Simplify right side
    20,469.57x = 245,242,144.15
  5. Step 5: Solve for x
    x = 245,242,144.15/20,469.57
  6. Step 6: Final answer
    x = 11,980.82

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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.