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Finding the Fourth Proportional to 640.50, 960.75 and 229.75

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Solution

The fourth proportional to 640.50, 960.75 and 229.75 is: 344.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.50 : 960.75 = 229.75 : x
  2. Step 2: Convert to fraction form
    640.50/960.75 = 229.75/x
  3. Step 3: Cross multiply
    640.50x = 960.75 × 229.75
  4. Step 4: Simplify right side
    640.50x = 220,734.14
  5. Step 5: Solve for x
    x = 220,734.14/640.50
  6. Step 6: Final answer
    x = 344.63

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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.