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Finding the Fourth Proportional to 321.34, 481.40 and 288.49

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Solution

The fourth proportional to 321.34, 481.40 and 288.49 is: 432.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.34 : 481.40 = 288.49 : x
  2. Step 2: Convert to fraction form
    321.34/481.40 = 288.49/x
  3. Step 3: Cross multiply
    321.34x = 481.40 × 288.49
  4. Step 4: Simplify right side
    321.34x = 138,879.09
  5. Step 5: Solve for x
    x = 138,879.09/321.34
  6. Step 6: Final answer
    x = 432.19

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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.