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Finding the Fourth Proportional to 128,031.73, 191,939.16 and 53,105.11

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Solution

The fourth proportional to 128,031.73, 191,939.16 and 53,105.11 is: 79,612.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,031.73 : 191,939.16 = 53,105.11 : x
  2. Step 2: Convert to fraction form
    128,031.73/191,939.16 = 53,105.11/x
  3. Step 3: Cross multiply
    128,031.73x = 191,939.16 × 53,105.11
  4. Step 4: Simplify right side
    128,031.73x = 10,192,949,939.58
  5. Step 5: Solve for x
    x = 10,192,949,939.58/128,031.73
  6. Step 6: Final answer
    x = 79,612.69

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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.