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Finding the Fourth Proportional to 139,280.80, 208,834.80 and 80,087.20

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Solution

The fourth proportional to 139,280.80, 208,834.80 and 80,087.20 is: 120,081.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,280.80 : 208,834.80 = 80,087.20 : x
  2. Step 2: Convert to fraction form
    139,280.80/208,834.80 = 80,087.20/x
  3. Step 3: Cross multiply
    139,280.80x = 208,834.80 × 80,087.20
  4. Step 4: Simplify right side
    139,280.80x = 16,724,994,394.56
  5. Step 5: Solve for x
    x = 16,724,994,394.56/139,280.80
  6. Step 6: Final answer
    x = 120,081.12

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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.