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Finding the Fourth Proportional to 1,198.85, 1,652.99 and 779.07

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Solution

The fourth proportional to 1,198.85, 1,652.99 and 779.07 is: 1,074.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,198.85 : 1,652.99 = 779.07 : x
  2. Step 2: Convert to fraction form
    1,198.85/1,652.99 = 779.07/x
  3. Step 3: Cross multiply
    1,198.85x = 1,652.99 × 779.07
  4. Step 4: Simplify right side
    1,198.85x = 1,287,791.02
  5. Step 5: Solve for x
    x = 1,287,791.02/1,198.85
  6. Step 6: Final answer
    x = 1,074.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.