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Finding the Fourth Proportional to 258,627.43, 387,947.67 and 71,640.55

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Solution

The fourth proportional to 258,627.43, 387,947.67 and 71,640.55 is: 107,462.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,627.43 : 387,947.67 = 71,640.55 : x
  2. Step 2: Convert to fraction form
    258,627.43/387,947.67 = 71,640.55/x
  3. Step 3: Cross multiply
    258,627.43x = 387,947.67 × 71,640.55
  4. Step 4: Simplify right side
    258,627.43x = 27,792,784,450.02
  5. Step 5: Solve for x
    x = 27,792,784,450.02/258,627.43
  6. Step 6: Final answer
    x = 107,462.63

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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.