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Finding the Fourth Proportional to 128,661.72, 192,986.40 and 35,167.68

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Solution

The fourth proportional to 128,661.72, 192,986.40 and 35,167.68 is: 52,749.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,661.72 : 192,986.40 = 35,167.68 : x
  2. Step 2: Convert to fraction form
    128,661.72/192,986.40 = 35,167.68/x
  3. Step 3: Cross multiply
    128,661.72x = 192,986.40 × 35,167.68
  4. Step 4: Simplify right side
    128,661.72x = 6,786,883,959.55
  5. Step 5: Solve for x
    x = 6,786,883,959.55/128,661.72
  6. Step 6: Final answer
    x = 52,749.83

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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.