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Finding the Fourth Proportional to 1,328.11, 1,992.56 and 679.30

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Solution

The fourth proportional to 1,328.11, 1,992.56 and 679.30 is: 1,019.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.11 : 1,992.56 = 679.30 : x
  2. Step 2: Convert to fraction form
    1,328.11/1,992.56 = 679.30/x
  3. Step 3: Cross multiply
    1,328.11x = 1,992.56 × 679.30
  4. Step 4: Simplify right side
    1,328.11x = 1,353,537.74
  5. Step 5: Solve for x
    x = 1,353,537.74/1,328.11
  6. Step 6: Final answer
    x = 1,019.15

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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.