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Finding the Fourth Proportional to 640.38, 960.65 and 229.42

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Solution

The fourth proportional to 640.38, 960.65 and 229.42 is: 344.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.38 : 960.65 = 229.42 : x
  2. Step 2: Convert to fraction form
    640.38/960.65 = 229.42/x
  3. Step 3: Cross multiply
    640.38x = 960.65 × 229.42
  4. Step 4: Simplify right side
    640.38x = 220,392.32
  5. Step 5: Solve for x
    x = 220,392.32/640.38
  6. Step 6: Final answer
    x = 344.16

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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.