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Finding the Fourth Proportional to 2,619.71, 3,928.54 and 864.64

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Solution

The fourth proportional to 2,619.71, 3,928.54 and 864.64 is: 1,296.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.71 : 3,928.54 = 864.64 : x
  2. Step 2: Convert to fraction form
    2,619.71/3,928.54 = 864.64/x
  3. Step 3: Cross multiply
    2,619.71x = 3,928.54 × 864.64
  4. Step 4: Simplify right side
    2,619.71x = 3,396,772.83
  5. Step 5: Solve for x
    x = 3,396,772.83/2,619.71
  6. Step 6: Final answer
    x = 1,296.62

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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.