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Finding the Fourth Proportional to 274,387.20, 412,455.60 and 258,640.80

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Solution

The fourth proportional to 274,387.20, 412,455.60 and 258,640.80 is: 388,785.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    274,387.20 : 412,455.60 = 258,640.80 : x
  2. Step 2: Convert to fraction form
    274,387.20/412,455.60 = 258,640.80/x
  3. Step 3: Cross multiply
    274,387.20x = 412,455.60 × 258,640.80
  4. Step 4: Simplify right side
    274,387.20x = 106,677,846,348.48
  5. Step 5: Solve for x
    x = 106,677,846,348.48/274,387.20
  6. Step 6: Final answer
    x = 388,785.80

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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.