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Finding the Fourth Proportional to 455.58, 628.02 and 331.38

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Solution

The fourth proportional to 455.58, 628.02 and 331.38 is: 456.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.58 : 628.02 = 331.38 : x
  2. Step 2: Convert to fraction form
    455.58/628.02 = 331.38/x
  3. Step 3: Cross multiply
    455.58x = 628.02 × 331.38
  4. Step 4: Simplify right side
    455.58x = 208,113.27
  5. Step 5: Solve for x
    x = 208,113.27/455.58
  6. Step 6: Final answer
    x = 456.81

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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.