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Finding the Fourth Proportional to 139,804.23, 192,928.17 and 79,376.61

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Solution

The fourth proportional to 139,804.23, 192,928.17 and 79,376.61 is: 109,538.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,804.23 : 192,928.17 = 79,376.61 : x
  2. Step 2: Convert to fraction form
    139,804.23/192,928.17 = 79,376.61/x
  3. Step 3: Cross multiply
    139,804.23x = 192,928.17 × 79,376.61
  4. Step 4: Simplify right side
    139,804.23x = 15,313,984,108.10
  5. Step 5: Solve for x
    x = 15,313,984,108.10/139,804.23
  6. Step 6: Final answer
    x = 109,538.78

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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.