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Finding the Fourth Proportional to 455.07, 628.07 and 331.30

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Solution

The fourth proportional to 455.07, 628.07 and 331.30 is: 457.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.07 : 628.07 = 331.30 : x
  2. Step 2: Convert to fraction form
    455.07/628.07 = 331.30/x
  3. Step 3: Cross multiply
    455.07x = 628.07 × 331.30
  4. Step 4: Simplify right side
    455.07x = 208,077.05
  5. Step 5: Solve for x
    x = 208,077.05/455.07
  6. Step 6: Final answer
    x = 457.24

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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.