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Finding the Fourth Proportional to 139,687.34, 209,197.49 and 80,398.37

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Solution

The fourth proportional to 139,687.34, 209,197.49 and 80,398.37 is: 120,405.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,687.34 : 209,197.49 = 80,398.37 : x
  2. Step 2: Convert to fraction form
    139,687.34/209,197.49 = 80,398.37/x
  3. Step 3: Cross multiply
    139,687.34x = 209,197.49 × 80,398.37
  4. Step 4: Simplify right side
    139,687.34x = 16,819,137,325.09
  5. Step 5: Solve for x
    x = 16,819,137,325.09/139,687.34
  6. Step 6: Final answer
    x = 120,405.60

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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.