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Finding the Fourth Proportional to 428,049.60, 640,845.60 and 415,761.60

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Solution

The fourth proportional to 428,049.60, 640,845.60 and 415,761.60 is: 622,448.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,049.60 : 640,845.60 = 415,761.60 : x
  2. Step 2: Convert to fraction form
    428,049.60/640,845.60 = 415,761.60/x
  3. Step 3: Cross multiply
    428,049.60x = 640,845.60 × 415,761.60
  4. Step 4: Simplify right side
    428,049.60x = 266,438,992,008.96
  5. Step 5: Solve for x
    x = 266,438,992,008.96/428,049.60
  6. Step 6: Final answer
    x = 622,448.88

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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.