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Finding the Fourth Proportional to 324.79, 487.08 and 108.31

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Solution

The fourth proportional to 324.79, 487.08 and 108.31 is: 162.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.79 : 487.08 = 108.31 : x
  2. Step 2: Convert to fraction form
    324.79/487.08 = 108.31/x
  3. Step 3: Cross multiply
    324.79x = 487.08 × 108.31
  4. Step 4: Simplify right side
    324.79x = 52,755.63
  5. Step 5: Solve for x
    x = 52,755.63/324.79
  6. Step 6: Final answer
    x = 162.43

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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.