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Finding the Fourth Proportional to 455, 628.08 and 300.20

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Solution

The fourth proportional to 455, 628.08 and 300.20 is: 414.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    455 : 628.08 = 300.20 : x
  2. Step 2: Convert to fraction form
    455/628.08 = 300.20/x
  3. Step 3: Cross multiply
    455x = 628.08 × 300.20
  4. Step 4: Simplify right side
    455x = 188,549.62
  5. Step 5: Solve for x
    x = 188,549.62/455
  6. Step 6: Final answer
    x = 414.39

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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.