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Finding the Fourth Proportional to 640.79, 959.75 and 396.62

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Solution

The fourth proportional to 640.79, 959.75 and 396.62 is: 594.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.79 : 959.75 = 396.62 : x
  2. Step 2: Convert to fraction form
    640.79/959.75 = 396.62/x
  3. Step 3: Cross multiply
    640.79x = 959.75 × 396.62
  4. Step 4: Simplify right side
    640.79x = 380,654.06
  5. Step 5: Solve for x
    x = 380,654.06/640.79
  6. Step 6: Final answer
    x = 594.04

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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.