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Finding the Fourth Proportional to 139,234.21, 192,155.64 and 81,844.77

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Solution

The fourth proportional to 139,234.21, 192,155.64 and 81,844.77 is: 112,953.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,234.21 : 192,155.64 = 81,844.77 : x
  2. Step 2: Convert to fraction form
    139,234.21/192,155.64 = 81,844.77/x
  3. Step 3: Cross multiply
    139,234.21x = 192,155.64 × 81,844.77
  4. Step 4: Simplify right side
    139,234.21x = 15,726,934,160.00
  5. Step 5: Solve for x
    x = 15,726,934,160.00/139,234.21
  6. Step 6: Final answer
    x = 112,953.09

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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.