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Finding the Fourth Proportional to 664.74, 996.07 and 420.75

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Solution

The fourth proportional to 664.74, 996.07 and 420.75 is: 630.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.74 : 996.07 = 420.75 : x
  2. Step 2: Convert to fraction form
    664.74/996.07 = 420.75/x
  3. Step 3: Cross multiply
    664.74x = 996.07 × 420.75
  4. Step 4: Simplify right side
    664.74x = 419,096.19
  5. Step 5: Solve for x
    x = 419,096.19/664.74
  6. Step 6: Final answer
    x = 630.47

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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.