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Finding the Fourth Proportional to 128,611.62, 192,945.60 and 43,219.44

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Solution

The fourth proportional to 128,611.62, 192,945.60 and 43,219.44 is: 64,838.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,611.62 : 192,945.60 = 43,219.44 : x
  2. Step 2: Convert to fraction form
    128,611.62/192,945.60 = 43,219.44/x
  3. Step 3: Cross multiply
    128,611.62x = 192,945.60 × 43,219.44
  4. Step 4: Simplify right side
    128,611.62x = 8,339,000,782.46
  5. Step 5: Solve for x
    x = 8,339,000,782.46/128,611.62
  6. Step 6: Final answer
    x = 64,838.63

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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.