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Finding the Fourth Proportional to 11,328, 16,992.96 and 3,120

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Solution

The fourth proportional to 11,328, 16,992.96 and 3,120 is: 4,680.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,328 : 16,992.96 = 3,120 : x
  2. Step 2: Convert to fraction form
    11,328/16,992.96 = 3,120/x
  3. Step 3: Cross multiply
    11,328x = 16,992.96 × 3,120
  4. Step 4: Simplify right side
    11,328x = 53,018,035.20
  5. Step 5: Solve for x
    x = 53,018,035.20/11,328
  6. Step 6: Final answer
    x = 4,680.26

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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.