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Finding the Fourth Proportional to 428,290.80, 641,821.80 and 315,087.60

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Solution

The fourth proportional to 428,290.80, 641,821.80 and 315,087.60 is: 472,179.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,290.80 : 641,821.80 = 315,087.60 : x
  2. Step 2: Convert to fraction form
    428,290.80/641,821.80 = 315,087.60/x
  3. Step 3: Cross multiply
    428,290.80x = 641,821.80 × 315,087.60
  4. Step 4: Simplify right side
    428,290.80x = 202,230,090,589.68
  5. Step 5: Solve for x
    x = 202,230,090,589.68/428,290.80
  6. Step 6: Final answer
    x = 472,179.39

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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.