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Finding the Fourth Proportional to 128,665.72, 192,992.40 and 35,171.68

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Solution

The fourth proportional to 128,665.72, 192,992.40 and 35,171.68 is: 52,755.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,665.72 : 192,992.40 = 35,171.68 : x
  2. Step 2: Convert to fraction form
    128,665.72/192,992.40 = 35,171.68/x
  3. Step 3: Cross multiply
    128,665.72x = 192,992.40 × 35,171.68
  4. Step 4: Simplify right side
    128,665.72x = 6,787,866,935.23
  5. Step 5: Solve for x
    x = 6,787,866,935.23/128,665.72
  6. Step 6: Final answer
    x = 52,755.83

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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.