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Finding the Fourth Proportional to 258,912.48, 388,366.56 and 66,786.42

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Solution

The fourth proportional to 258,912.48, 388,366.56 and 66,786.42 is: 100,179.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,912.48 : 388,366.56 = 66,786.42 : x
  2. Step 2: Convert to fraction form
    258,912.48/388,366.56 = 66,786.42/x
  3. Step 3: Cross multiply
    258,912.48x = 388,366.56 × 66,786.42
  4. Step 4: Simplify right side
    258,912.48x = 25,937,612,190.12
  5. Step 5: Solve for x
    x = 25,937,612,190.12/258,912.48
  6. Step 6: Final answer
    x = 100,179.07

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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.