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Finding the Fourth Proportional to 1,329.39, 1,992.87 and 678.69

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Solution

The fourth proportional to 1,329.39, 1,992.87 and 678.69 is: 1,017.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.39 : 1,992.87 = 678.69 : x
  2. Step 2: Convert to fraction form
    1,329.39/1,992.87 = 678.69/x
  3. Step 3: Cross multiply
    1,329.39x = 1,992.87 × 678.69
  4. Step 4: Simplify right side
    1,329.39x = 1,352,540.94
  5. Step 5: Solve for x
    x = 1,352,540.94/1,329.39
  6. Step 6: Final answer
    x = 1,017.41

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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.