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Finding the Fourth Proportional to 20,469.60, 30,705.03 and 7,989.12

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Solution

The fourth proportional to 20,469.60, 30,705.03 and 7,989.12 is: 11,983.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,469.60 : 30,705.03 = 7,989.12 : x
  2. Step 2: Convert to fraction form
    20,469.60/30,705.03 = 7,989.12/x
  3. Step 3: Cross multiply
    20,469.60x = 30,705.03 × 7,989.12
  4. Step 4: Simplify right side
    20,469.60x = 245,306,169.27
  5. Step 5: Solve for x
    x = 245,306,169.27/20,469.60
  6. Step 6: Final answer
    x = 11,983.93

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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.