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Finding the Fourth Proportional to 128,359.86, 192,410.39 and 53,521.33

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Solution

The fourth proportional to 128,359.86, 192,410.39 and 53,521.33 is: 80,228.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,359.86 : 192,410.39 = 53,521.33 : x
  2. Step 2: Convert to fraction form
    128,359.86/192,410.39 = 53,521.33/x
  3. Step 3: Cross multiply
    128,359.86x = 192,410.39 × 53,521.33
  4. Step 4: Simplify right side
    128,359.86x = 10,298,058,748.96
  5. Step 5: Solve for x
    x = 10,298,058,748.96/128,359.86
  6. Step 6: Final answer
    x = 80,228.03

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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.