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Finding the Fourth Proportional to 139,422.48, 192,405.41 and 78,991.62

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Solution

The fourth proportional to 139,422.48, 192,405.41 and 78,991.62 is: 109,009.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,422.48 : 192,405.41 = 78,991.62 : x
  2. Step 2: Convert to fraction form
    139,422.48/192,405.41 = 78,991.62/x
  3. Step 3: Cross multiply
    139,422.48x = 192,405.41 × 78,991.62
  4. Step 4: Simplify right side
    139,422.48x = 15,198,415,032.66
  5. Step 5: Solve for x
    x = 15,198,415,032.66/139,422.48
  6. Step 6: Final answer
    x = 109,009.79

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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.