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Finding the Fourth Proportional to 330.12, 455.34 and 218.10

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Solution

The fourth proportional to 330.12, 455.34 and 218.10 is: 300.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.12 : 455.34 = 218.10 : x
  2. Step 2: Convert to fraction form
    330.12/455.34 = 218.10/x
  3. Step 3: Cross multiply
    330.12x = 455.34 × 218.10
  4. Step 4: Simplify right side
    330.12x = 99,310.61
  5. Step 5: Solve for x
    x = 99,310.61/330.12
  6. Step 6: Final answer
    x = 300.83

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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.