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Finding the Fourth Proportional to 2,619.78, 3,928.77 and 888

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Solution

The fourth proportional to 2,619.78, 3,928.77 and 888 is: 1,331.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.78 : 3,928.77 = 888 : x
  2. Step 2: Convert to fraction form
    2,619.78/3,928.77 = 888/x
  3. Step 3: Cross multiply
    2,619.78x = 3,928.77 × 888
  4. Step 4: Simplify right side
    2,619.78x = 3,488,747.76
  5. Step 5: Solve for x
    x = 3,488,747.76/2,619.78
  6. Step 6: Final answer
    x = 1,331.69

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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.