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Finding the Fourth Proportional to 7,179, 9,906.96 and 3,992.32

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Solution

The fourth proportional to 7,179, 9,906.96 and 3,992.32 is: 5,509.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,179 : 9,906.96 = 3,992.32 : x
  2. Step 2: Convert to fraction form
    7,179/9,906.96 = 3,992.32/x
  3. Step 3: Cross multiply
    7,179x = 9,906.96 × 3,992.32
  4. Step 4: Simplify right side
    7,179x = 39,551,754.55
  5. Step 5: Solve for x
    x = 39,551,754.55/7,179
  6. Step 6: Final answer
    x = 5,509.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.