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Finding the Fourth Proportional to 139,740.36, 192,835.60 and 76,078.36

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Solution

The fourth proportional to 139,740.36, 192,835.60 and 76,078.36 is: 104,984.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,740.36 : 192,835.60 = 76,078.36 : x
  2. Step 2: Convert to fraction form
    139,740.36/192,835.60 = 76,078.36/x
  3. Step 3: Cross multiply
    139,740.36x = 192,835.60 × 76,078.36
  4. Step 4: Simplify right side
    139,740.36x = 14,670,616,197.62
  5. Step 5: Solve for x
    x = 14,670,616,197.62/139,740.36
  6. Step 6: Final answer
    x = 104,984.82

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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.