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Finding the Fourth Proportional to 1,198.98, 1,655.24 and 779.58

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Solution

The fourth proportional to 1,198.98, 1,655.24 and 779.58 is: 1,076.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,198.98 : 1,655.24 = 779.58 : x
  2. Step 2: Convert to fraction form
    1,198.98/1,655.24 = 779.58/x
  3. Step 3: Cross multiply
    1,198.98x = 1,655.24 × 779.58
  4. Step 4: Simplify right side
    1,198.98x = 1,290,388.10
  5. Step 5: Solve for x
    x = 1,290,388.10/1,198.98
  6. Step 6: Final answer
    x = 1,076.24

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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.