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Finding the Fourth Proportional to 454.91, 682.06 and 211.31

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Solution

The fourth proportional to 454.91, 682.06 and 211.31 is: 316.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.91 : 682.06 = 211.31 : x
  2. Step 2: Convert to fraction form
    454.91/682.06 = 211.31/x
  3. Step 3: Cross multiply
    454.91x = 682.06 × 211.31
  4. Step 4: Simplify right side
    454.91x = 144,122.69
  5. Step 5: Solve for x
    x = 144,122.69/454.91
  6. Step 6: Final answer
    x = 316.82

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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.