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Finding the Fourth Proportional to 423.11, 634.20 and 286.11

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Solution

The fourth proportional to 423.11, 634.20 and 286.11 is: 428.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.11 : 634.20 = 286.11 : x
  2. Step 2: Convert to fraction form
    423.11/634.20 = 286.11/x
  3. Step 3: Cross multiply
    423.11x = 634.20 × 286.11
  4. Step 4: Simplify right side
    423.11x = 181,450.96
  5. Step 5: Solve for x
    x = 181,450.96/423.11
  6. Step 6: Final answer
    x = 428.85

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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.