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Finding the Fourth Proportional to 279.28, 385.21 and 174.42

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Solution

The fourth proportional to 279.28, 385.21 and 174.42 is: 240.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.28 : 385.21 = 174.42 : x
  2. Step 2: Convert to fraction form
    279.28/385.21 = 174.42/x
  3. Step 3: Cross multiply
    279.28x = 385.21 × 174.42
  4. Step 4: Simplify right side
    279.28x = 67,188.33
  5. Step 5: Solve for x
    x = 67,188.33/279.28
  6. Step 6: Final answer
    x = 240.58

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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.