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Finding the Fourth Proportional to 279.34, 385.47 and 213.74

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Solution

The fourth proportional to 279.34, 385.47 and 213.74 is: 294.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.34 : 385.47 = 213.74 : x
  2. Step 2: Convert to fraction form
    279.34/385.47 = 213.74/x
  3. Step 3: Cross multiply
    279.34x = 385.47 × 213.74
  4. Step 4: Simplify right side
    279.34x = 82,390.36
  5. Step 5: Solve for x
    x = 82,390.36/279.34
  6. Step 6: Final answer
    x = 294.95

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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.