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Finding the Fourth Proportional to 13,167.72, 19,755.60 and 7,908.60

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Solution

The fourth proportional to 13,167.72, 19,755.60 and 7,908.60 is: 11,865.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,167.72 : 19,755.60 = 7,908.60 : x
  2. Step 2: Convert to fraction form
    13,167.72/19,755.60 = 7,908.60/x
  3. Step 3: Cross multiply
    13,167.72x = 19,755.60 × 7,908.60
  4. Step 4: Simplify right side
    13,167.72x = 156,239,138.16
  5. Step 5: Solve for x
    x = 156,239,138.16/13,167.72
  6. Step 6: Final answer
    x = 11,865.31

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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.