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Finding the Fourth Proportional to 428.11, 642.16 and 119.96

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Solution

The fourth proportional to 428.11, 642.16 and 119.96 is: 179.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.11 : 642.16 = 119.96 : x
  2. Step 2: Convert to fraction form
    428.11/642.16 = 119.96/x
  3. Step 3: Cross multiply
    428.11x = 642.16 × 119.96
  4. Step 4: Simplify right side
    428.11x = 77,033.76
  5. Step 5: Solve for x
    x = 77,033.76/428.11
  6. Step 6: Final answer
    x = 179.94

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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.