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Finding the Fourth Proportional to 423.09, 634.33 and 285.79

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Solution

The fourth proportional to 423.09, 634.33 and 285.79 is: 428.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.09 : 634.33 = 285.79 : x
  2. Step 2: Convert to fraction form
    423.09/634.33 = 285.79/x
  3. Step 3: Cross multiply
    423.09x = 634.33 × 285.79
  4. Step 4: Simplify right side
    423.09x = 181,285.17
  5. Step 5: Solve for x
    x = 181,285.17/423.09
  6. Step 6: Final answer
    x = 428.48

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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.