Home / 7,981.45-11,972.16-2,137.90

Finding the Fourth Proportional to 7,981.45, 11,972.16 and 2,137.90

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Solution

The fourth proportional to 7,981.45, 11,972.16 and 2,137.90 is: 3,206.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,981.45 : 11,972.16 = 2,137.90 : x
  2. Step 2: Convert to fraction form
    7,981.45/11,972.16 = 2,137.90/x
  3. Step 3: Cross multiply
    7,981.45x = 11,972.16 × 2,137.90
  4. Step 4: Simplify right side
    7,981.45x = 25,595,280.86
  5. Step 5: Solve for x
    x = 25,595,280.86/7,981.45
  6. Step 6: Final answer
    x = 3,206.85

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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.