Home / 2,121.28-3,181.11-659.95

Finding the Fourth Proportional to 2,121.28, 3,181.11 and 659.95

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Solution

The fourth proportional to 2,121.28, 3,181.11 and 659.95 is: 989.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.28 : 3,181.11 = 659.95 : x
  2. Step 2: Convert to fraction form
    2,121.28/3,181.11 = 659.95/x
  3. Step 3: Cross multiply
    2,121.28x = 3,181.11 × 659.95
  4. Step 4: Simplify right side
    2,121.28x = 2,099,373.54
  5. Step 5: Solve for x
    x = 2,099,373.54/2,121.28
  6. Step 6: Final answer
    x = 989.67

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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.