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Finding the Fourth Proportional to 279.31, 385.41 and 154.94

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Solution

The fourth proportional to 279.31, 385.41 and 154.94 is: 213.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.31 : 385.41 = 154.94 : x
  2. Step 2: Convert to fraction form
    279.31/385.41 = 154.94/x
  3. Step 3: Cross multiply
    279.31x = 385.41 × 154.94
  4. Step 4: Simplify right side
    279.31x = 59,713.97
  5. Step 5: Solve for x
    x = 59,713.97/279.31
  6. Step 6: Final answer
    x = 213.79

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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.