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Finding the Fourth Proportional to 642.78, 963.34 and 296.03

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Solution

The fourth proportional to 642.78, 963.34 and 296.03 is: 443.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.78 : 963.34 = 296.03 : x
  2. Step 2: Convert to fraction form
    642.78/963.34 = 296.03/x
  3. Step 3: Cross multiply
    642.78x = 963.34 × 296.03
  4. Step 4: Simplify right side
    642.78x = 285,177.54
  5. Step 5: Solve for x
    x = 285,177.54/642.78
  6. Step 6: Final answer
    x = 443.66

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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.