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Finding the Fourth Proportional to 642.29, 963.11 and 330.03

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Solution

The fourth proportional to 642.29, 963.11 and 330.03 is: 494.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.29 : 963.11 = 330.03 : x
  2. Step 2: Convert to fraction form
    642.29/963.11 = 330.03/x
  3. Step 3: Cross multiply
    642.29x = 963.11 × 330.03
  4. Step 4: Simplify right side
    642.29x = 317,856.02
  5. Step 5: Solve for x
    x = 317,856.02/642.29
  6. Step 6: Final answer
    x = 494.88

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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.