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Finding the Fourth Proportional to 428.72, 641.64 and 351.44

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Solution

The fourth proportional to 428.72, 641.64 and 351.44 is: 525.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.72 : 641.64 = 351.44 : x
  2. Step 2: Convert to fraction form
    428.72/641.64 = 351.44/x
  3. Step 3: Cross multiply
    428.72x = 641.64 × 351.44
  4. Step 4: Simplify right side
    428.72x = 225,497.96
  5. Step 5: Solve for x
    x = 225,497.96/428.72
  6. Step 6: Final answer
    x = 525.98

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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.