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Finding the Fourth Proportional to 11,918.55, 17,872.07 and 6,989.79

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Solution

The fourth proportional to 11,918.55, 17,872.07 and 6,989.79 is: 10,481.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,918.55 : 17,872.07 = 6,989.79 : x
  2. Step 2: Convert to fraction form
    11,918.55/17,872.07 = 6,989.79/x
  3. Step 3: Cross multiply
    11,918.55x = 17,872.07 × 6,989.79
  4. Step 4: Simplify right side
    11,918.55x = 124,921,981.22
  5. Step 5: Solve for x
    x = 124,921,981.22/11,918.55
  6. Step 6: Final answer
    x = 10,481.31

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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.