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Finding the Fourth Proportional to 128,620.68, 192,923.54 and 38,661.44

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Solution

The fourth proportional to 128,620.68, 192,923.54 and 38,661.44 is: 57,989.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,620.68 : 192,923.54 = 38,661.44 : x
  2. Step 2: Convert to fraction form
    128,620.68/192,923.54 = 38,661.44/x
  3. Step 3: Cross multiply
    128,620.68x = 192,923.54 × 38,661.44
  4. Step 4: Simplify right side
    128,620.68x = 7,458,701,866.30
  5. Step 5: Solve for x
    x = 7,458,701,866.30/128,620.68
  6. Step 6: Final answer
    x = 57,989.91

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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.