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Finding the Fourth Proportional to 279.61, 385.89 and 169.11

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Solution

The fourth proportional to 279.61, 385.89 and 169.11 is: 233.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.61 : 385.89 = 169.11 : x
  2. Step 2: Convert to fraction form
    279.61/385.89 = 169.11/x
  3. Step 3: Cross multiply
    279.61x = 385.89 × 169.11
  4. Step 4: Simplify right side
    279.61x = 65,257.86
  5. Step 5: Solve for x
    x = 65,257.86/279.61
  6. Step 6: Final answer
    x = 233.39

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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.