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Finding the Fourth Proportional to 447.72, 671.78 and 429.49

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Solution

The fourth proportional to 447.72, 671.78 and 429.49 is: 644.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.72 : 671.78 = 429.49 : x
  2. Step 2: Convert to fraction form
    447.72/671.78 = 429.49/x
  3. Step 3: Cross multiply
    447.72x = 671.78 × 429.49
  4. Step 4: Simplify right side
    447.72x = 288,522.79
  5. Step 5: Solve for x
    x = 288,522.79/447.72
  6. Step 6: Final answer
    x = 644.43

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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.