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Finding the Fourth Proportional to 139,900.20, 209,850.30 and 76,914.60

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Solution

The fourth proportional to 139,900.20, 209,850.30 and 76,914.60 is: 115,371.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,900.20 : 209,850.30 = 76,914.60 : x
  2. Step 2: Convert to fraction form
    139,900.20/209,850.30 = 76,914.60/x
  3. Step 3: Cross multiply
    139,900.20x = 209,850.30 × 76,914.60
  4. Step 4: Simplify right side
    139,900.20x = 16,140,551,884.38
  5. Step 5: Solve for x
    x = 16,140,551,884.38/139,900.20
  6. Step 6: Final answer
    x = 115,371.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.