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Finding the Fourth Proportional to 209.92, 315.04 and 181.12

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Solution

The fourth proportional to 209.92, 315.04 and 181.12 is: 271.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.92 : 315.04 = 181.12 : x
  2. Step 2: Convert to fraction form
    209.92/315.04 = 181.12/x
  3. Step 3: Cross multiply
    209.92x = 315.04 × 181.12
  4. Step 4: Simplify right side
    209.92x = 57,060.04
  5. Step 5: Solve for x
    x = 57,060.04/209.92
  6. Step 6: Final answer
    x = 271.82

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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.