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Finding the Fourth Proportional to 324.28, 486.42 and 80.81

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Solution

The fourth proportional to 324.28, 486.42 and 80.81 is: 121.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.28 : 486.42 = 80.81 : x
  2. Step 2: Convert to fraction form
    324.28/486.42 = 80.81/x
  3. Step 3: Cross multiply
    324.28x = 486.42 × 80.81
  4. Step 4: Simplify right side
    324.28x = 39,307.60
  5. Step 5: Solve for x
    x = 39,307.60/324.28
  6. Step 6: Final answer
    x = 121.22

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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.