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Finding the Fourth Proportional to 426,007.20, 639,101.52 and 126,488.64

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Solution

The fourth proportional to 426,007.20, 639,101.52 and 126,488.64 is: 189,759.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,007.20 : 639,101.52 = 126,488.64 : x
  2. Step 2: Convert to fraction form
    426,007.20/639,101.52 = 126,488.64/x
  3. Step 3: Cross multiply
    426,007.20x = 639,101.52 × 126,488.64
  4. Step 4: Simplify right side
    426,007.20x = 80,839,082,086.73
  5. Step 5: Solve for x
    x = 80,839,082,086.73/426,007.20
  6. Step 6: Final answer
    x = 189,759.90

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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.