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Finding the Fourth Proportional to 640.62, 884 and 378.60

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Solution

The fourth proportional to 640.62, 884 and 378.60 is: 522.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.62 : 884 = 378.60 : x
  2. Step 2: Convert to fraction form
    640.62/884 = 378.60/x
  3. Step 3: Cross multiply
    640.62x = 884 × 378.60
  4. Step 4: Simplify right side
    640.62x = 334,682.40
  5. Step 5: Solve for x
    x = 334,682.40/640.62
  6. Step 6: Final answer
    x = 522.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.