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Finding the Fourth Proportional to 455.47, 628.80 and 331

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Solution

The fourth proportional to 455.47, 628.80 and 331 is: 456.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.47 : 628.80 = 331 : x
  2. Step 2: Convert to fraction form
    455.47/628.80 = 331/x
  3. Step 3: Cross multiply
    455.47x = 628.80 × 331
  4. Step 4: Simplify right side
    455.47x = 208,132.80
  5. Step 5: Solve for x
    x = 208,132.80/455.47
  6. Step 6: Final answer
    x = 456.96

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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.