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Finding the Fourth Proportional to 455.89, 682.89 and 212.62

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Solution

The fourth proportional to 455.89, 682.89 and 212.62 is: 318.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.89 : 682.89 = 212.62 : x
  2. Step 2: Convert to fraction form
    455.89/682.89 = 212.62/x
  3. Step 3: Cross multiply
    455.89x = 682.89 × 212.62
  4. Step 4: Simplify right side
    455.89x = 145,193.57
  5. Step 5: Solve for x
    x = 145,193.57/455.89
  6. Step 6: Final answer
    x = 318.49

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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.