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Finding the Fourth Proportional to 639.75, 960.03 and 423.48

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Solution

The fourth proportional to 639.75, 960.03 and 423.48 is: 635.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.75 : 960.03 = 423.48 : x
  2. Step 2: Convert to fraction form
    639.75/960.03 = 423.48/x
  3. Step 3: Cross multiply
    639.75x = 960.03 × 423.48
  4. Step 4: Simplify right side
    639.75x = 406,553.50
  5. Step 5: Solve for x
    x = 406,553.50/639.75
  6. Step 6: Final answer
    x = 635.49

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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.