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Finding the Fourth Proportional to 268.79, 402.72 and 211.38

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Solution

The fourth proportional to 268.79, 402.72 and 211.38 is: 316.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.79 : 402.72 = 211.38 : x
  2. Step 2: Convert to fraction form
    268.79/402.72 = 211.38/x
  3. Step 3: Cross multiply
    268.79x = 402.72 × 211.38
  4. Step 4: Simplify right side
    268.79x = 85,126.95
  5. Step 5: Solve for x
    x = 85,126.95/268.79
  6. Step 6: Final answer
    x = 316.71

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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.