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Finding the Fourth Proportional to 455.11, 682.90 and 211.81

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Solution

The fourth proportional to 455.11, 682.90 and 211.81 is: 317.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.11 : 682.90 = 211.81 : x
  2. Step 2: Convert to fraction form
    455.11/682.90 = 211.81/x
  3. Step 3: Cross multiply
    455.11x = 682.90 × 211.81
  4. Step 4: Simplify right side
    455.11x = 144,645.05
  5. Step 5: Solve for x
    x = 144,645.05/455.11
  6. Step 6: Final answer
    x = 317.82

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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.