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Finding the Fourth Proportional to 324.42, 486.38 and 262.78

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Solution

The fourth proportional to 324.42, 486.38 and 262.78 is: 393.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.42 : 486.38 = 262.78 : x
  2. Step 2: Convert to fraction form
    324.42/486.38 = 262.78/x
  3. Step 3: Cross multiply
    324.42x = 486.38 × 262.78
  4. Step 4: Simplify right side
    324.42x = 127,810.94
  5. Step 5: Solve for x
    x = 127,810.94/324.42
  6. Step 6: Final answer
    x = 393.97

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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.