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Finding the Fourth Proportional to 455.38, 682.54 and 211.40

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Solution

The fourth proportional to 455.38, 682.54 and 211.40 is: 316.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.38 : 682.54 = 211.40 : x
  2. Step 2: Convert to fraction form
    455.38/682.54 = 211.40/x
  3. Step 3: Cross multiply
    455.38x = 682.54 × 211.40
  4. Step 4: Simplify right side
    455.38x = 144,288.96
  5. Step 5: Solve for x
    x = 144,288.96/455.38
  6. Step 6: Final answer
    x = 316.85

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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.