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Finding the Fourth Proportional to 642.80, 963.89 and 231.88

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Solution

The fourth proportional to 642.80, 963.89 and 231.88 is: 347.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.80 : 963.89 = 231.88 : x
  2. Step 2: Convert to fraction form
    642.80/963.89 = 231.88/x
  3. Step 3: Cross multiply
    642.80x = 963.89 × 231.88
  4. Step 4: Simplify right side
    642.80x = 223,504.11
  5. Step 5: Solve for x
    x = 223,504.11/642.80
  6. Step 6: Final answer
    x = 347.71

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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.