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Finding the Fourth Proportional to 455.36, 682.49 and 211.38

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Solution

The fourth proportional to 455.36, 682.49 and 211.38 is: 316.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.36 : 682.49 = 211.38 : x
  2. Step 2: Convert to fraction form
    455.36/682.49 = 211.38/x
  3. Step 3: Cross multiply
    455.36x = 682.49 × 211.38
  4. Step 4: Simplify right side
    455.36x = 144,262.71
  5. Step 5: Solve for x
    x = 144,262.71/455.36
  6. Step 6: Final answer
    x = 316.81

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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.