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Finding the Fourth Proportional to 139,705.56, 192,787.70 and 76,043.21

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Solution

The fourth proportional to 139,705.56, 192,787.70 and 76,043.21 is: 104,936.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,705.56 : 192,787.70 = 76,043.21 : x
  2. Step 2: Convert to fraction form
    139,705.56/192,787.70 = 76,043.21/x
  3. Step 3: Cross multiply
    139,705.56x = 192,787.70 × 76,043.21
  4. Step 4: Simplify right side
    139,705.56x = 14,660,194,212.36
  5. Step 5: Solve for x
    x = 14,660,194,212.36/139,705.56
  6. Step 6: Final answer
    x = 104,936.37

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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.