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Finding the Fourth Proportional to 492,638.87, 679,858.41 and 285,891.25

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Solution

The fourth proportional to 492,638.87, 679,858.41 and 285,891.25 is: 394,539.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    492,638.87 : 679,858.41 = 285,891.25 : x
  2. Step 2: Convert to fraction form
    492,638.87/679,858.41 = 285,891.25/x
  3. Step 3: Cross multiply
    492,638.87x = 679,858.41 × 285,891.25
  4. Step 4: Simplify right side
    492,638.87x = 194,365,571,473.78
  5. Step 5: Solve for x
    x = 194,365,571,473.78/492,638.87
  6. Step 6: Final answer
    x = 394,539.66

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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.