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Finding the Fourth Proportional to 139,912.64, 193,063.20 and 85,437.44

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Solution

The fourth proportional to 139,912.64, 193,063.20 and 85,437.44 is: 117,893.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,912.64 : 193,063.20 = 85,437.44 : x
  2. Step 2: Convert to fraction form
    139,912.64/193,063.20 = 85,437.44/x
  3. Step 3: Cross multiply
    139,912.64x = 193,063.20 × 85,437.44
  4. Step 4: Simplify right side
    139,912.64x = 16,494,825,566.21
  5. Step 5: Solve for x
    x = 16,494,825,566.21/139,912.64
  6. Step 6: Final answer
    x = 117,893.75

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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.