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Finding the Fourth Proportional to 139,687.84, 209,198.24 and 80,398.87

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Solution

The fourth proportional to 139,687.84, 209,198.24 and 80,398.87 is: 120,406.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,687.84 : 209,198.24 = 80,398.87 : x
  2. Step 2: Convert to fraction form
    139,687.84/209,198.24 = 80,398.87/x
  3. Step 3: Cross multiply
    139,687.84x = 209,198.24 × 80,398.87
  4. Step 4: Simplify right side
    139,687.84x = 16,819,302,222.99
  5. Step 5: Solve for x
    x = 16,819,302,222.99/139,687.84
  6. Step 6: Final answer
    x = 120,406.35

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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.