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Finding the Fourth Proportional to 455.44, 628.56 and 280.96

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Solution

The fourth proportional to 455.44, 628.56 and 280.96 is: 387.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.44 : 628.56 = 280.96 : x
  2. Step 2: Convert to fraction form
    455.44/628.56 = 280.96/x
  3. Step 3: Cross multiply
    455.44x = 628.56 × 280.96
  4. Step 4: Simplify right side
    455.44x = 176,600.22
  5. Step 5: Solve for x
    x = 176,600.22/455.44
  6. Step 6: Final answer
    x = 387.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.