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Finding the Fourth Proportional to 642.11, 963.37 and 445.28

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Solution

The fourth proportional to 642.11, 963.37 and 445.28 is: 668.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.11 : 963.37 = 445.28 : x
  2. Step 2: Convert to fraction form
    642.11/963.37 = 445.28/x
  3. Step 3: Cross multiply
    642.11x = 963.37 × 445.28
  4. Step 4: Simplify right side
    642.11x = 428,969.39
  5. Step 5: Solve for x
    x = 428,969.39/642.11
  6. Step 6: Final answer
    x = 668.06

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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.