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Finding the Fourth Proportional to 489.86, 676.29 and 324.56

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Solution

The fourth proportional to 489.86, 676.29 and 324.56 is: 448.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.86 : 676.29 = 324.56 : x
  2. Step 2: Convert to fraction form
    489.86/676.29 = 324.56/x
  3. Step 3: Cross multiply
    489.86x = 676.29 × 324.56
  4. Step 4: Simplify right side
    489.86x = 219,496.68
  5. Step 5: Solve for x
    x = 219,496.68/489.86
  6. Step 6: Final answer
    x = 448.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.