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Finding the Fourth Proportional to 330.85, 456.42 and 212.79

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Solution

The fourth proportional to 330.85, 456.42 and 212.79 is: 293.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.85 : 456.42 = 212.79 : x
  2. Step 2: Convert to fraction form
    330.85/456.42 = 212.79/x
  3. Step 3: Cross multiply
    330.85x = 456.42 × 212.79
  4. Step 4: Simplify right side
    330.85x = 97,120.55
  5. Step 5: Solve for x
    x = 97,120.55/330.85
  6. Step 6: Final answer
    x = 293.55

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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.