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Finding the Fourth Proportional to 2,712.69, 4,069.13 and 864

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Solution

The fourth proportional to 2,712.69, 4,069.13 and 864 is: 1,296.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,712.69 : 4,069.13 = 864 : x
  2. Step 2: Convert to fraction form
    2,712.69/4,069.13 = 864/x
  3. Step 3: Cross multiply
    2,712.69x = 4,069.13 × 864
  4. Step 4: Simplify right side
    2,712.69x = 3,515,724
  5. Step 5: Solve for x
    x = 3,515,724/2,712.69
  6. Step 6: Final answer
    x = 1,296.03

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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.