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Finding the Fourth Proportional to 7,855.80, 11,779.65 and 2,922.90

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Solution

The fourth proportional to 7,855.80, 11,779.65 and 2,922.90 is: 4,382.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,855.80 : 11,779.65 = 2,922.90 : x
  2. Step 2: Convert to fraction form
    7,855.80/11,779.65 = 2,922.90/x
  3. Step 3: Cross multiply
    7,855.80x = 11,779.65 × 2,922.90
  4. Step 4: Simplify right side
    7,855.80x = 34,430,738.99
  5. Step 5: Solve for x
    x = 34,430,738.99/7,855.80
  6. Step 6: Final answer
    x = 4,382.84

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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.