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Finding the Fourth Proportional to 640.62, 960.84 and 289.48

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Solution

The fourth proportional to 640.62, 960.84 and 289.48 is: 434.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.62 : 960.84 = 289.48 : x
  2. Step 2: Convert to fraction form
    640.62/960.84 = 289.48/x
  3. Step 3: Cross multiply
    640.62x = 960.84 × 289.48
  4. Step 4: Simplify right side
    640.62x = 278,143.96
  5. Step 5: Solve for x
    x = 278,143.96/640.62
  6. Step 6: Final answer
    x = 434.18

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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.