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Finding the Fourth Proportional to 128,072.10, 192,128.40 and 43,840.20

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Solution

The fourth proportional to 128,072.10, 192,128.40 and 43,840.20 is: 65,767.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,072.10 : 192,128.40 = 43,840.20 : x
  2. Step 2: Convert to fraction form
    128,072.10/192,128.40 = 43,840.20/x
  3. Step 3: Cross multiply
    128,072.10x = 192,128.40 × 43,840.20
  4. Step 4: Simplify right side
    128,072.10x = 8,422,947,481.68
  5. Step 5: Solve for x
    x = 8,422,947,481.68/128,072.10
  6. Step 6: Final answer
    x = 65,767.23

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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.