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Finding the Fourth Proportional to 455.43, 682.86 and 212.04

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Solution

The fourth proportional to 455.43, 682.86 and 212.04 is: 317.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.43 : 682.86 = 212.04 : x
  2. Step 2: Convert to fraction form
    455.43/682.86 = 212.04/x
  3. Step 3: Cross multiply
    455.43x = 682.86 × 212.04
  4. Step 4: Simplify right side
    455.43x = 144,793.63
  5. Step 5: Solve for x
    x = 144,793.63/455.43
  6. Step 6: Final answer
    x = 317.93

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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.