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Finding the Fourth Proportional to 1,993.79, 2,751.35 and 1,109.61

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Solution

The fourth proportional to 1,993.79, 2,751.35 and 1,109.61 is: 1,531.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,993.79 : 2,751.35 = 1,109.61 : x
  2. Step 2: Convert to fraction form
    1,993.79/2,751.35 = 1,109.61/x
  3. Step 3: Cross multiply
    1,993.79x = 2,751.35 × 1,109.61
  4. Step 4: Simplify right side
    1,993.79x = 3,052,919.93
  5. Step 5: Solve for x
    x = 3,052,919.93/1,993.79
  6. Step 6: Final answer
    x = 1,531.22

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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.