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Finding the Fourth Proportional to 447.01, 671.54 and 428.58

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Solution

The fourth proportional to 447.01, 671.54 and 428.58 is: 643.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.01 : 671.54 = 428.58 : x
  2. Step 2: Convert to fraction form
    447.01/671.54 = 428.58/x
  3. Step 3: Cross multiply
    447.01x = 671.54 × 428.58
  4. Step 4: Simplify right side
    447.01x = 287,808.61
  5. Step 5: Solve for x
    x = 287,808.61/447.01
  6. Step 6: Final answer
    x = 643.85

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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.