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Finding the Fourth Proportional to 455.48, 628.39 and 280.52

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Solution

The fourth proportional to 455.48, 628.39 and 280.52 is: 387.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.48 : 628.39 = 280.52 : x
  2. Step 2: Convert to fraction form
    455.48/628.39 = 280.52/x
  3. Step 3: Cross multiply
    455.48x = 628.39 × 280.52
  4. Step 4: Simplify right side
    455.48x = 176,277.97
  5. Step 5: Solve for x
    x = 176,277.97/455.48
  6. Step 6: Final answer
    x = 387.01

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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.