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Finding the Fourth Proportional to 324.34, 486.50 and 80.87

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Solution

The fourth proportional to 324.34, 486.50 and 80.87 is: 121.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.34 : 486.50 = 80.87 : x
  2. Step 2: Convert to fraction form
    324.34/486.50 = 80.87/x
  3. Step 3: Cross multiply
    324.34x = 486.50 × 80.87
  4. Step 4: Simplify right side
    324.34x = 39,340.42
  5. Step 5: Solve for x
    x = 39,340.42/324.34
  6. Step 6: Final answer
    x = 121.29

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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.