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Finding the Fourth Proportional to 642.61, 963.96 and 252.73

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Solution

The fourth proportional to 642.61, 963.96 and 252.73 is: 379.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.61 : 963.96 = 252.73 : x
  2. Step 2: Convert to fraction form
    642.61/963.96 = 252.73/x
  3. Step 3: Cross multiply
    642.61x = 963.96 × 252.73
  4. Step 4: Simplify right side
    642.61x = 243,621.61
  5. Step 5: Solve for x
    x = 243,621.61/642.61
  6. Step 6: Final answer
    x = 379.11

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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.