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Finding the Fourth Proportional to 640.62, 884.25 and 620.10

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Solution

The fourth proportional to 640.62, 884.25 and 620.10 is: 855.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.62 : 884.25 = 620.10 : x
  2. Step 2: Convert to fraction form
    640.62/884.25 = 620.10/x
  3. Step 3: Cross multiply
    640.62x = 884.25 × 620.10
  4. Step 4: Simplify right side
    640.62x = 548,323.43
  5. Step 5: Solve for x
    x = 548,323.43/640.62
  6. Step 6: Final answer
    x = 855.93

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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.