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Finding the Fourth Proportional to 639.98, 960.05 and 201.26

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Solution

The fourth proportional to 639.98, 960.05 and 201.26 is: 301.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.98 : 960.05 = 201.26 : x
  2. Step 2: Convert to fraction form
    639.98/960.05 = 201.26/x
  3. Step 3: Cross multiply
    639.98x = 960.05 × 201.26
  4. Step 4: Simplify right side
    639.98x = 193,219.66
  5. Step 5: Solve for x
    x = 193,219.66/639.98
  6. Step 6: Final answer
    x = 301.92

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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.