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Finding the Fourth Proportional to 324.33, 486.42 and 139.16

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Solution

The fourth proportional to 324.33, 486.42 and 139.16 is: 208.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.33 : 486.42 = 139.16 : x
  2. Step 2: Convert to fraction form
    324.33/486.42 = 139.16/x
  3. Step 3: Cross multiply
    324.33x = 486.42 × 139.16
  4. Step 4: Simplify right side
    324.33x = 67,690.90
  5. Step 5: Solve for x
    x = 67,690.90/324.33
  6. Step 6: Final answer
    x = 208.71

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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.