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Finding the Fourth Proportional to 311.62, 429.78 and 274.19

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Solution

The fourth proportional to 311.62, 429.78 and 274.19 is: 378.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.62 : 429.78 = 274.19 : x
  2. Step 2: Convert to fraction form
    311.62/429.78 = 274.19/x
  3. Step 3: Cross multiply
    311.62x = 429.78 × 274.19
  4. Step 4: Simplify right side
    311.62x = 117,840.35
  5. Step 5: Solve for x
    x = 117,840.35/311.62
  6. Step 6: Final answer
    x = 378.16

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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.