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Finding the Fourth Proportional to 643.87, 888.72 and 382.03

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Solution

The fourth proportional to 643.87, 888.72 and 382.03 is: 527.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.87 : 888.72 = 382.03 : x
  2. Step 2: Convert to fraction form
    643.87/888.72 = 382.03/x
  3. Step 3: Cross multiply
    643.87x = 888.72 × 382.03
  4. Step 4: Simplify right side
    643.87x = 339,517.70
  5. Step 5: Solve for x
    x = 339,517.70/643.87
  6. Step 6: Final answer
    x = 527.31

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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.