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Finding the Fourth Proportional to 639.72, 959.59 and 201.07

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Solution

The fourth proportional to 639.72, 959.59 and 201.07 is: 301.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.72 : 959.59 = 201.07 : x
  2. Step 2: Convert to fraction form
    639.72/959.59 = 201.07/x
  3. Step 3: Cross multiply
    639.72x = 959.59 × 201.07
  4. Step 4: Simplify right side
    639.72x = 192,944.76
  5. Step 5: Solve for x
    x = 192,944.76/639.72
  6. Step 6: Final answer
    x = 301.61

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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.