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Finding the Fourth Proportional to 640.42, 960.58 and 201.71

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Solution

The fourth proportional to 640.42, 960.58 and 201.71 is: 302.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.42 : 960.58 = 201.71 : x
  2. Step 2: Convert to fraction form
    640.42/960.58 = 201.71/x
  3. Step 3: Cross multiply
    640.42x = 960.58 × 201.71
  4. Step 4: Simplify right side
    640.42x = 193,754.71
  5. Step 5: Solve for x
    x = 193,754.71/640.42
  6. Step 6: Final answer
    x = 302.54

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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.