Home / 2,140.24-3,211.20-679.60

Finding the Fourth Proportional to 2,140.24, 3,211.20 and 679.60

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Solution

The fourth proportional to 2,140.24, 3,211.20 and 679.60 is: 1,019.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.24 : 3,211.20 = 679.60 : x
  2. Step 2: Convert to fraction form
    2,140.24/3,211.20 = 679.60/x
  3. Step 3: Cross multiply
    2,140.24x = 3,211.20 × 679.60
  4. Step 4: Simplify right side
    2,140.24x = 2,182,331.52
  5. Step 5: Solve for x
    x = 2,182,331.52/2,140.24
  6. Step 6: Final answer
    x = 1,019.67

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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.