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Finding the Fourth Proportional to 445.35, 668.10 and 214.20

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Solution

The fourth proportional to 445.35, 668.10 and 214.20 is: 321.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.35 : 668.10 = 214.20 : x
  2. Step 2: Convert to fraction form
    445.35/668.10 = 214.20/x
  3. Step 3: Cross multiply
    445.35x = 668.10 × 214.20
  4. Step 4: Simplify right side
    445.35x = 143,105.95
  5. Step 5: Solve for x
    x = 143,105.95/445.35
  6. Step 6: Final answer
    x = 321.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.