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Finding the Fourth Proportional to 428.18, 641.07 and 325.17

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Solution

The fourth proportional to 428.18, 641.07 and 325.17 is: 486.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.18 : 641.07 = 325.17 : x
  2. Step 2: Convert to fraction form
    428.18/641.07 = 325.17/x
  3. Step 3: Cross multiply
    428.18x = 641.07 × 325.17
  4. Step 4: Simplify right side
    428.18x = 208,456.73
  5. Step 5: Solve for x
    x = 208,456.73/428.18
  6. Step 6: Final answer
    x = 486.85

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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.