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Finding the Fourth Proportional to 2,808.20, 4,208.70 and 2,155.70

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Solution

The fourth proportional to 2,808.20, 4,208.70 and 2,155.70 is: 3,230.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,808.20 : 4,208.70 = 2,155.70 : x
  2. Step 2: Convert to fraction form
    2,808.20/4,208.70 = 2,155.70/x
  3. Step 3: Cross multiply
    2,808.20x = 4,208.70 × 2,155.70
  4. Step 4: Simplify right side
    2,808.20x = 9,072,694.59
  5. Step 5: Solve for x
    x = 9,072,694.59/2,808.20
  6. Step 6: Final answer
    x = 3,230.79

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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.