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Finding the Fourth Proportional to 662.66, 995.37 and 639.63

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Solution

The fourth proportional to 662.66, 995.37 and 639.63 is: 960.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.66 : 995.37 = 639.63 : x
  2. Step 2: Convert to fraction form
    662.66/995.37 = 639.63/x
  3. Step 3: Cross multiply
    662.66x = 995.37 × 639.63
  4. Step 4: Simplify right side
    662.66x = 636,662.38
  5. Step 5: Solve for x
    x = 636,662.38/662.66
  6. Step 6: Final answer
    x = 960.78

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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.