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Finding the Fourth Proportional to 1,198.58, 1,789.12 and 1,052.78

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Solution

The fourth proportional to 1,198.58, 1,789.12 and 1,052.78 is: 1,571.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,198.58 : 1,789.12 = 1,052.78 : x
  2. Step 2: Convert to fraction form
    1,198.58/1,789.12 = 1,052.78/x
  3. Step 3: Cross multiply
    1,198.58x = 1,789.12 × 1,052.78
  4. Step 4: Simplify right side
    1,198.58x = 1,883,549.75
  5. Step 5: Solve for x
    x = 1,883,549.75/1,198.58
  6. Step 6: Final answer
    x = 1,571.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.