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Finding the Fourth Proportional to 139,321.44, 192,265.88 and 78,890.49

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Solution

The fourth proportional to 139,321.44, 192,265.88 and 78,890.49 is: 108,870.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,321.44 : 192,265.88 = 78,890.49 : x
  2. Step 2: Convert to fraction form
    139,321.44/192,265.88 = 78,890.49/x
  3. Step 3: Cross multiply
    139,321.44x = 192,265.88 × 78,890.49
  4. Step 4: Simplify right side
    139,321.44x = 15,167,949,089.03
  5. Step 5: Solve for x
    x = 15,167,949,089.03/139,321.44
  6. Step 6: Final answer
    x = 108,870.17

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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.