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Finding the Fourth Proportional to 1,198.52, 1,653.88 and 779.12

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Solution

The fourth proportional to 1,198.52, 1,653.88 and 779.12 is: 1,075.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,198.52 : 1,653.88 = 779.12 : x
  2. Step 2: Convert to fraction form
    1,198.52/1,653.88 = 779.12/x
  3. Step 3: Cross multiply
    1,198.52x = 1,653.88 × 779.12
  4. Step 4: Simplify right side
    1,198.52x = 1,288,570.99
  5. Step 5: Solve for x
    x = 1,288,570.99/1,198.52
  6. Step 6: Final answer
    x = 1,075.14

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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.