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Finding the Fourth Proportional to 642.58, 963.09 and 295.43

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Solution

The fourth proportional to 642.58, 963.09 and 295.43 is: 442.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.58 : 963.09 = 295.43 : x
  2. Step 2: Convert to fraction form
    642.58/963.09 = 295.43/x
  3. Step 3: Cross multiply
    642.58x = 963.09 × 295.43
  4. Step 4: Simplify right side
    642.58x = 284,520.86
  5. Step 5: Solve for x
    x = 284,520.86/642.58
  6. Step 6: Final answer
    x = 442.78

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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.