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Finding the Fourth Proportional to 272.21, 375.81 and 209.92

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Solution

The fourth proportional to 272.21, 375.81 and 209.92 is: 289.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.21 : 375.81 = 209.92 : x
  2. Step 2: Convert to fraction form
    272.21/375.81 = 209.92/x
  3. Step 3: Cross multiply
    272.21x = 375.81 × 209.92
  4. Step 4: Simplify right side
    272.21x = 78,890.04
  5. Step 5: Solve for x
    x = 78,890.04/272.21
  6. Step 6: Final answer
    x = 289.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.