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Finding the Fourth Proportional to 279.32, 418.42 and 221.64

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Solution

The fourth proportional to 279.32, 418.42 and 221.64 is: 332.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.32 : 418.42 = 221.64 : x
  2. Step 2: Convert to fraction form
    279.32/418.42 = 221.64/x
  3. Step 3: Cross multiply
    279.32x = 418.42 × 221.64
  4. Step 4: Simplify right side
    279.32x = 92,738.61
  5. Step 5: Solve for x
    x = 92,738.61/279.32
  6. Step 6: Final answer
    x = 332.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.