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Finding the Fourth Proportional to 139,143.78, 192,018.74 and 75,481.83

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Solution

The fourth proportional to 139,143.78, 192,018.74 and 75,481.83 is: 104,165.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,143.78 : 192,018.74 = 75,481.83 : x
  2. Step 2: Convert to fraction form
    139,143.78/192,018.74 = 75,481.83/x
  3. Step 3: Cross multiply
    139,143.78x = 192,018.74 × 75,481.83
  4. Step 4: Simplify right side
    139,143.78x = 14,493,925,512.09
  5. Step 5: Solve for x
    x = 14,493,925,512.09/139,143.78
  6. Step 6: Final answer
    x = 104,165.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.