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Finding the Fourth Proportional to 455.44, 628.28 and 287.31

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Solution

The fourth proportional to 455.44, 628.28 and 287.31 is: 396.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.44 : 628.28 = 287.31 : x
  2. Step 2: Convert to fraction form
    455.44/628.28 = 287.31/x
  3. Step 3: Cross multiply
    455.44x = 628.28 × 287.31
  4. Step 4: Simplify right side
    455.44x = 180,511.95
  5. Step 5: Solve for x
    x = 180,511.95/455.44
  6. Step 6: Final answer
    x = 396.35

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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.