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Finding the Fourth Proportional to 658.64, 989.32 and 636.78

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Solution

The fourth proportional to 658.64, 989.32 and 636.78 is: 956.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.64 : 989.32 = 636.78 : x
  2. Step 2: Convert to fraction form
    658.64/989.32 = 636.78/x
  3. Step 3: Cross multiply
    658.64x = 989.32 × 636.78
  4. Step 4: Simplify right side
    658.64x = 629,979.19
  5. Step 5: Solve for x
    x = 629,979.19/658.64
  6. Step 6: Final answer
    x = 956.48

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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.