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Finding the Fourth Proportional to 455.12, 682.45 and 211.44

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Solution

The fourth proportional to 455.12, 682.45 and 211.44 is: 317.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.12 : 682.45 = 211.44 : x
  2. Step 2: Convert to fraction form
    455.12/682.45 = 211.44/x
  3. Step 3: Cross multiply
    455.12x = 682.45 × 211.44
  4. Step 4: Simplify right side
    455.12x = 144,297.23
  5. Step 5: Solve for x
    x = 144,297.23/455.12
  6. Step 6: Final answer
    x = 317.05

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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.