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Finding the Fourth Proportional to 2,618.88, 3,928.41 and 1,319.64

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Solution

The fourth proportional to 2,618.88, 3,928.41 and 1,319.64 is: 1,979.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,618.88 : 3,928.41 = 1,319.64 : x
  2. Step 2: Convert to fraction form
    2,618.88/3,928.41 = 1,319.64/x
  3. Step 3: Cross multiply
    2,618.88x = 3,928.41 × 1,319.64
  4. Step 4: Simplify right side
    2,618.88x = 5,184,086.97
  5. Step 5: Solve for x
    x = 5,184,086.97/2,618.88
  6. Step 6: Final answer
    x = 1,979.51

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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.