Home / 2,679.20-4,019.28-830.18

Finding the Fourth Proportional to 2,679.20, 4,019.28 and 830.18

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Solution

The fourth proportional to 2,679.20, 4,019.28 and 830.18 is: 1,245.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,679.20 : 4,019.28 = 830.18 : x
  2. Step 2: Convert to fraction form
    2,679.20/4,019.28 = 830.18/x
  3. Step 3: Cross multiply
    2,679.20x = 4,019.28 × 830.18
  4. Step 4: Simplify right side
    2,679.20x = 3,336,735.92
  5. Step 5: Solve for x
    x = 3,336,735.92/2,679.20
  6. Step 6: Final answer
    x = 1,245.42

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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.