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Finding the Fourth Proportional to 455.45, 682.45 and 272.61

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Solution

The fourth proportional to 455.45, 682.45 and 272.61 is: 408.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.45 : 682.45 = 272.61 : x
  2. Step 2: Convert to fraction form
    455.45/682.45 = 272.61/x
  3. Step 3: Cross multiply
    455.45x = 682.45 × 272.61
  4. Step 4: Simplify right side
    455.45x = 186,042.01
  5. Step 5: Solve for x
    x = 186,042.01/455.45
  6. Step 6: Final answer
    x = 408.48

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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.