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Finding the Fourth Proportional to 423.48, 634.23 and 408.89

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Solution

The fourth proportional to 423.48, 634.23 and 408.89 is: 612.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.48 : 634.23 = 408.89 : x
  2. Step 2: Convert to fraction form
    423.48/634.23 = 408.89/x
  3. Step 3: Cross multiply
    423.48x = 634.23 × 408.89
  4. Step 4: Simplify right side
    423.48x = 259,327.13
  5. Step 5: Solve for x
    x = 259,327.13/423.48
  6. Step 6: Final answer
    x = 612.37

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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.