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Finding the Fourth Proportional to 455.20, 627.76 and 324.32

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Solution

The fourth proportional to 455.20, 627.76 and 324.32 is: 447.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.20 : 627.76 = 324.32 : x
  2. Step 2: Convert to fraction form
    455.20/627.76 = 324.32/x
  3. Step 3: Cross multiply
    455.20x = 627.76 × 324.32
  4. Step 4: Simplify right side
    455.20x = 203,595.12
  5. Step 5: Solve for x
    x = 203,595.12/455.20
  6. Step 6: Final answer
    x = 447.27

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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.