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Finding the Fourth Proportional to 272.39, 408.86 and 212.18

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Solution

The fourth proportional to 272.39, 408.86 and 212.18 is: 318.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.39 : 408.86 = 212.18 : x
  2. Step 2: Convert to fraction form
    272.39/408.86 = 212.18/x
  3. Step 3: Cross multiply
    272.39x = 408.86 × 212.18
  4. Step 4: Simplify right side
    272.39x = 86,748.81
  5. Step 5: Solve for x
    x = 86,748.81/272.39
  6. Step 6: Final answer
    x = 318.48

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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.