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Finding the Fourth Proportional to 1,329.78, 1,992.85 and 679.15

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Solution

The fourth proportional to 1,329.78, 1,992.85 and 679.15 is: 1,017.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.78 : 1,992.85 = 679.15 : x
  2. Step 2: Convert to fraction form
    1,329.78/1,992.85 = 679.15/x
  3. Step 3: Cross multiply
    1,329.78x = 1,992.85 × 679.15
  4. Step 4: Simplify right side
    1,329.78x = 1,353,444.08
  5. Step 5: Solve for x
    x = 1,353,444.08/1,329.78
  6. Step 6: Final answer
    x = 1,017.80

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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.