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Finding the Fourth Proportional to 455.12, 627.68 and 331.20

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Solution

The fourth proportional to 455.12, 627.68 and 331.20 is: 456.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.12 : 627.68 = 331.20 : x
  2. Step 2: Convert to fraction form
    455.12/627.68 = 331.20/x
  3. Step 3: Cross multiply
    455.12x = 627.68 × 331.20
  4. Step 4: Simplify right side
    455.12x = 207,887.62
  5. Step 5: Solve for x
    x = 207,887.62/455.12
  6. Step 6: Final answer
    x = 456.78

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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.