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Finding the Fourth Proportional to 279.21, 385.60 and 248.67

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Solution

The fourth proportional to 279.21, 385.60 and 248.67 is: 343.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.21 : 385.60 = 248.67 : x
  2. Step 2: Convert to fraction form
    279.21/385.60 = 248.67/x
  3. Step 3: Cross multiply
    279.21x = 385.60 × 248.67
  4. Step 4: Simplify right side
    279.21x = 95,885.22
  5. Step 5: Solve for x
    x = 95,885.22/279.21
  6. Step 6: Final answer
    x = 343.42

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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.