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Finding the Fourth Proportional to 279.29, 385.79 and 214.59

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Solution

The fourth proportional to 279.29, 385.79 and 214.59 is: 296.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.29 : 385.79 = 214.59 : x
  2. Step 2: Convert to fraction form
    279.29/385.79 = 214.59/x
  3. Step 3: Cross multiply
    279.29x = 385.79 × 214.59
  4. Step 4: Simplify right side
    279.29x = 82,786.68
  5. Step 5: Solve for x
    x = 82,786.68/279.29
  6. Step 6: Final answer
    x = 296.42

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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.