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Finding the Fourth Proportional to 211.87, 317.38 and 168.61

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Solution

The fourth proportional to 211.87, 317.38 and 168.61 is: 252.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.87 : 317.38 = 168.61 : x
  2. Step 2: Convert to fraction form
    211.87/317.38 = 168.61/x
  3. Step 3: Cross multiply
    211.87x = 317.38 × 168.61
  4. Step 4: Simplify right side
    211.87x = 53,511.01
  5. Step 5: Solve for x
    x = 53,511.01/211.87
  6. Step 6: Final answer
    x = 252.57

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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.