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Finding the Fourth Proportional to 1,249.80, 1,878.30 and 1,091.40

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Solution

The fourth proportional to 1,249.80, 1,878.30 and 1,091.40 is: 1,640.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.80 : 1,878.30 = 1,091.40 : x
  2. Step 2: Convert to fraction form
    1,249.80/1,878.30 = 1,091.40/x
  3. Step 3: Cross multiply
    1,249.80x = 1,878.30 × 1,091.40
  4. Step 4: Simplify right side
    1,249.80x = 2,049,976.62
  5. Step 5: Solve for x
    x = 2,049,976.62/1,249.80
  6. Step 6: Final answer
    x = 1,640.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.