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Finding the Fourth Proportional to 2,619.21, 3,927.79 and 864.14

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Solution

The fourth proportional to 2,619.21, 3,927.79 and 864.14 is: 1,295.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.21 : 3,927.79 = 864.14 : x
  2. Step 2: Convert to fraction form
    2,619.21/3,927.79 = 864.14/x
  3. Step 3: Cross multiply
    2,619.21x = 3,927.79 × 864.14
  4. Step 4: Simplify right side
    2,619.21x = 3,394,160.45
  5. Step 5: Solve for x
    x = 3,394,160.45/2,619.21
  6. Step 6: Final answer
    x = 1,295.87

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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.