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Finding the Fourth Proportional to 7,728, 11,492.59 and 7,481.97

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Solution

The fourth proportional to 7,728, 11,492.59 and 7,481.97 is: 11,126.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,728 : 11,492.59 = 7,481.97 : x
  2. Step 2: Convert to fraction form
    7,728/11,492.59 = 7,481.97/x
  3. Step 3: Cross multiply
    7,728x = 11,492.59 × 7,481.97
  4. Step 4: Simplify right side
    7,728x = 85,987,213.60
  5. Step 5: Solve for x
    x = 85,987,213.60/7,728
  6. Step 6: Final answer
    x = 11,126.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.