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Finding the Fourth Proportional to 455.42, 682.88 and 212

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Solution

The fourth proportional to 455.42, 682.88 and 212 is: 317.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.42 : 682.88 = 212 : x
  2. Step 2: Convert to fraction form
    455.42/682.88 = 212/x
  3. Step 3: Cross multiply
    455.42x = 682.88 × 212
  4. Step 4: Simplify right side
    455.42x = 144,770.56
  5. Step 5: Solve for x
    x = 144,770.56/455.42
  6. Step 6: Final answer
    x = 317.88

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