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Finding the Fourth Proportional to 128,467.62, 192,743.34 and 57,381.60

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Solution

The fourth proportional to 128,467.62, 192,743.34 and 57,381.60 is: 86,091.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,467.62 : 192,743.34 = 57,381.60 : x
  2. Step 2: Convert to fraction form
    128,467.62/192,743.34 = 57,381.60/x
  3. Step 3: Cross multiply
    128,467.62x = 192,743.34 × 57,381.60
  4. Step 4: Simplify right side
    128,467.62x = 11,059,921,238.54
  5. Step 5: Solve for x
    x = 11,059,921,238.54/128,467.62
  6. Step 6: Final answer
    x = 86,091.12

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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.