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Finding the Fourth Proportional to 324.72, 487.36 and 129.86

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Solution

The fourth proportional to 324.72, 487.36 and 129.86 is: 194.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.72 : 487.36 = 129.86 : x
  2. Step 2: Convert to fraction form
    324.72/487.36 = 129.86/x
  3. Step 3: Cross multiply
    324.72x = 487.36 × 129.86
  4. Step 4: Simplify right side
    324.72x = 63,286.15
  5. Step 5: Solve for x
    x = 63,286.15/324.72
  6. Step 6: Final answer
    x = 194.89

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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.