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Finding the Fourth Proportional to 1,329.68, 1,992.32 and 679.52

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Solution

The fourth proportional to 1,329.68, 1,992.32 and 679.52 is: 1,018.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.68 : 1,992.32 = 679.52 : x
  2. Step 2: Convert to fraction form
    1,329.68/1,992.32 = 679.52/x
  3. Step 3: Cross multiply
    1,329.68x = 1,992.32 × 679.52
  4. Step 4: Simplify right side
    1,329.68x = 1,353,821.29
  5. Step 5: Solve for x
    x = 1,353,821.29/1,329.68
  6. Step 6: Final answer
    x = 1,018.16

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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.