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Finding the Fourth Proportional to 211.92, 317.93 and 109.25

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Solution

The fourth proportional to 211.92, 317.93 and 109.25 is: 163.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.92 : 317.93 = 109.25 : x
  2. Step 2: Convert to fraction form
    211.92/317.93 = 109.25/x
  3. Step 3: Cross multiply
    211.92x = 317.93 × 109.25
  4. Step 4: Simplify right side
    211.92x = 34,732.91
  5. Step 5: Solve for x
    x = 34,732.91/211.92
  6. Step 6: Final answer
    x = 163.90

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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.