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Finding the Fourth Proportional to 396,578.64, 548,354.88 and 390,168.84

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Solution

The fourth proportional to 396,578.64, 548,354.88 and 390,168.84 is: 539,491.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,578.64 : 548,354.88 = 390,168.84 : x
  2. Step 2: Convert to fraction form
    396,578.64/548,354.88 = 390,168.84/x
  3. Step 3: Cross multiply
    396,578.64x = 548,354.88 × 390,168.84
  4. Step 4: Simplify right side
    396,578.64x = 213,950,987,437.94
  5. Step 5: Solve for x
    x = 213,950,987,437.94/396,578.64
  6. Step 6: Final answer
    x = 539,491.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.