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Finding the Fourth Proportional to 2,685.80, 4,028.70 and 2,205.80

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Solution

The fourth proportional to 2,685.80, 4,028.70 and 2,205.80 is: 3,308.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,685.80 : 4,028.70 = 2,205.80 : x
  2. Step 2: Convert to fraction form
    2,685.80/4,028.70 = 2,205.80/x
  3. Step 3: Cross multiply
    2,685.80x = 4,028.70 × 2,205.80
  4. Step 4: Simplify right side
    2,685.80x = 8,886,506.46
  5. Step 5: Solve for x
    x = 8,886,506.46/2,685.80
  6. Step 6: Final answer
    x = 3,308.70

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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.