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Finding the Fourth Proportional to 3,855.90, 5,779.80 and 2,208.90

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Solution

The fourth proportional to 3,855.90, 5,779.80 and 2,208.90 is: 3,311.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,855.90 : 5,779.80 = 2,208.90 : x
  2. Step 2: Convert to fraction form
    3,855.90/5,779.80 = 2,208.90/x
  3. Step 3: Cross multiply
    3,855.90x = 5,779.80 × 2,208.90
  4. Step 4: Simplify right side
    3,855.90x = 12,767,000.22
  5. Step 5: Solve for x
    x = 12,767,000.22/3,855.90
  6. Step 6: Final answer
    x = 3,311.03

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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.