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Finding the Fourth Proportional to 18,989.20, 28,512.60 and 14,611.60

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Solution

The fourth proportional to 18,989.20, 28,512.60 and 14,611.60 is: 21,939.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.20 : 28,512.60 = 14,611.60 : x
  2. Step 2: Convert to fraction form
    18,989.20/28,512.60 = 14,611.60/x
  3. Step 3: Cross multiply
    18,989.20x = 28,512.60 × 14,611.60
  4. Step 4: Simplify right side
    18,989.20x = 416,614,706.16
  5. Step 5: Solve for x
    x = 416,614,706.16/18,989.20
  6. Step 6: Final answer
    x = 21,939.56

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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.