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Finding the Fourth Proportional to 1,867.80, 2,578.42 and 1,081.68

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Solution

The fourth proportional to 1,867.80, 2,578.42 and 1,081.68 is: 1,493.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,867.80 : 2,578.42 = 1,081.68 : x
  2. Step 2: Convert to fraction form
    1,867.80/2,578.42 = 1,081.68/x
  3. Step 3: Cross multiply
    1,867.80x = 2,578.42 × 1,081.68
  4. Step 4: Simplify right side
    1,867.80x = 2,789,025.35
  5. Step 5: Solve for x
    x = 2,789,025.35/1,867.80
  6. Step 6: Final answer
    x = 1,493.21

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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.