Home / 2,800.12-4,200.22-720.08

Finding the Fourth Proportional to 2,800.12, 4,200.22 and 720.08

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Solution

The fourth proportional to 2,800.12, 4,200.22 and 720.08 is: 1,080.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,800.12 : 4,200.22 = 720.08 : x
  2. Step 2: Convert to fraction form
    2,800.12/4,200.22 = 720.08/x
  3. Step 3: Cross multiply
    2,800.12x = 4,200.22 × 720.08
  4. Step 4: Simplify right side
    2,800.12x = 3,024,471.62
  5. Step 5: Solve for x
    x = 3,024,471.62/2,800.12
  6. Step 6: Final answer
    x = 1,080.12

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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.