Home / 2,720.20-4,082.36-1,991.67

Finding the Fourth Proportional to 2,720.20, 4,082.36 and 1,991.67

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Solution

The fourth proportional to 2,720.20, 4,082.36 and 1,991.67 is: 2,989.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,720.20 : 4,082.36 = 1,991.67 : x
  2. Step 2: Convert to fraction form
    2,720.20/4,082.36 = 1,991.67/x
  3. Step 3: Cross multiply
    2,720.20x = 4,082.36 × 1,991.67
  4. Step 4: Simplify right side
    2,720.20x = 8,130,713.94
  5. Step 5: Solve for x
    x = 8,130,713.94/2,720.20
  6. Step 6: Final answer
    x = 2,989.01

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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.