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Finding the Fourth Proportional to 426,249.14, 639,478.94 and 126,728.42

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Solution

The fourth proportional to 426,249.14, 639,478.94 and 126,728.42 is: 190,123.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,249.14 : 639,478.94 = 126,728.42 : x
  2. Step 2: Convert to fraction form
    426,249.14/639,478.94 = 126,728.42/x
  3. Step 3: Cross multiply
    426,249.14x = 639,478.94 × 126,728.42
  4. Step 4: Simplify right side
    426,249.14x = 81,040,151,858.44
  5. Step 5: Solve for x
    x = 81,040,151,858.44/426,249.14
  6. Step 6: Final answer
    x = 190,123.91

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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.