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Finding the Fourth Proportional to 2,628.98, 3,942.79 and 779.60

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Solution

The fourth proportional to 2,628.98, 3,942.79 and 779.60 is: 1,169.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,628.98 : 3,942.79 = 779.60 : x
  2. Step 2: Convert to fraction form
    2,628.98/3,942.79 = 779.60/x
  3. Step 3: Cross multiply
    2,628.98x = 3,942.79 × 779.60
  4. Step 4: Simplify right side
    2,628.98x = 3,073,806.99
  5. Step 5: Solve for x
    x = 3,073,806.99/2,628.98
  6. Step 6: Final answer
    x = 1,169.20

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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.