Home / 139,694.09-209,207.61-80,405.12

Finding the Fourth Proportional to 139,694.09, 209,207.61 and 80,405.12

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Solution

The fourth proportional to 139,694.09, 209,207.61 and 80,405.12 is: 120,415.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,694.09 : 209,207.61 = 80,405.12 : x
  2. Step 2: Convert to fraction form
    139,694.09/209,207.61 = 80,405.12/x
  3. Step 3: Cross multiply
    139,694.09x = 209,207.61 × 80,405.12
  4. Step 4: Simplify right side
    139,694.09x = 16,821,363,509.98
  5. Step 5: Solve for x
    x = 16,821,363,509.98/139,694.09
  6. Step 6: Final answer
    x = 120,415.72

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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.