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Finding the Fourth Proportional to 139,315.44, 192,257.60 and 78,884.49

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Solution

The fourth proportional to 139,315.44, 192,257.60 and 78,884.49 is: 108,861.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,315.44 : 192,257.60 = 78,884.49 : x
  2. Step 2: Convert to fraction form
    139,315.44/192,257.60 = 78,884.49/x
  3. Step 3: Cross multiply
    139,315.44x = 192,257.60 × 78,884.49
  4. Step 4: Simplify right side
    139,315.44x = 15,166,142,330.20
  5. Step 5: Solve for x
    x = 15,166,142,330.20/139,315.44
  6. Step 6: Final answer
    x = 108,861.89

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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.