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Finding the Fourth Proportional to 1,198.75, 1,654.60 and 980.05

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Solution

The fourth proportional to 1,198.75, 1,654.60 and 980.05 is: 1,352.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,198.75 : 1,654.60 = 980.05 : x
  2. Step 2: Convert to fraction form
    1,198.75/1,654.60 = 980.05/x
  3. Step 3: Cross multiply
    1,198.75x = 1,654.60 × 980.05
  4. Step 4: Simplify right side
    1,198.75x = 1,621,591.84
  5. Step 5: Solve for x
    x = 1,621,591.84/1,198.75
  6. Step 6: Final answer
    x = 1,352.74

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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.