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Finding the Fourth Proportional to 639.07, 956.88 and 443.66

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Solution

The fourth proportional to 639.07, 956.88 and 443.66 is: 664.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.07 : 956.88 = 443.66 : x
  2. Step 2: Convert to fraction form
    639.07/956.88 = 443.66/x
  3. Step 3: Cross multiply
    639.07x = 956.88 × 443.66
  4. Step 4: Simplify right side
    639.07x = 424,529.38
  5. Step 5: Solve for x
    x = 424,529.38/639.07
  6. Step 6: Final answer
    x = 664.29

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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.