Home / 2,211.91-3,318.94-1,390.57

Finding the Fourth Proportional to 2,211.91, 3,318.94 and 1,390.57

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Solution

The fourth proportional to 2,211.91, 3,318.94 and 1,390.57 is: 2,086.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,211.91 : 3,318.94 = 1,390.57 : x
  2. Step 2: Convert to fraction form
    2,211.91/3,318.94 = 1,390.57/x
  3. Step 3: Cross multiply
    2,211.91x = 3,318.94 × 1,390.57
  4. Step 4: Simplify right side
    2,211.91x = 4,615,211.84
  5. Step 5: Solve for x
    x = 4,615,211.84/2,211.91
  6. Step 6: Final answer
    x = 2,086.53

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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.