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Finding the Fourth Proportional to 639.68, 960.60 and 634.64

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Solution

The fourth proportional to 639.68, 960.60 and 634.64 is: 953.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.68 : 960.60 = 634.64 : x
  2. Step 2: Convert to fraction form
    639.68/960.60 = 634.64/x
  3. Step 3: Cross multiply
    639.68x = 960.60 × 634.64
  4. Step 4: Simplify right side
    639.68x = 609,635.18
  5. Step 5: Solve for x
    x = 609,635.18/639.68
  6. Step 6: Final answer
    x = 953.03

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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.