Home / 2,109.28-3,163.40-628.20

Finding the Fourth Proportional to 2,109.28, 3,163.40 and 628.20

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Solution

The fourth proportional to 2,109.28, 3,163.40 and 628.20 is: 942.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,109.28 : 3,163.40 = 628.20 : x
  2. Step 2: Convert to fraction form
    2,109.28/3,163.40 = 628.20/x
  3. Step 3: Cross multiply
    2,109.28x = 3,163.40 × 628.20
  4. Step 4: Simplify right side
    2,109.28x = 1,987,247.88
  5. Step 5: Solve for x
    x = 1,987,247.88/2,109.28
  6. Step 6: Final answer
    x = 942.15

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1.5x scale

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.