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Finding the Fourth Proportional to 355.30, 534.20 and 287.31

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Solution

The fourth proportional to 355.30, 534.20 and 287.31 is: 431.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.30 : 534.20 = 287.31 : x
  2. Step 2: Convert to fraction form
    355.30/534.20 = 287.31/x
  3. Step 3: Cross multiply
    355.30x = 534.20 × 287.31
  4. Step 4: Simplify right side
    355.30x = 153,481.57
  5. Step 5: Solve for x
    x = 153,481.57/355.30
  6. Step 6: Final answer
    x = 431.97

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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.