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Finding the Fourth Proportional to 324.40, 486.72 and 129.42

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Solution

The fourth proportional to 324.40, 486.72 and 129.42 is: 194.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.40 : 486.72 = 129.42 : x
  2. Step 2: Convert to fraction form
    324.40/486.72 = 129.42/x
  3. Step 3: Cross multiply
    324.40x = 486.72 × 129.42
  4. Step 4: Simplify right side
    324.40x = 62,991.30
  5. Step 5: Solve for x
    x = 62,991.30/324.40
  6. Step 6: Final answer
    x = 194.18

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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.