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Finding the Fourth Proportional to 640.75, 959.59 and 396.53

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Solution

The fourth proportional to 640.75, 959.59 and 396.53 is: 593.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.75 : 959.59 = 396.53 : x
  2. Step 2: Convert to fraction form
    640.75/959.59 = 396.53/x
  3. Step 3: Cross multiply
    640.75x = 959.59 × 396.53
  4. Step 4: Simplify right side
    640.75x = 380,506.22
  5. Step 5: Solve for x
    x = 380,506.22/640.75
  6. Step 6: Final answer
    x = 593.85

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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.