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Finding the Fourth Proportional to 311.69, 429.63 and 274.61

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Solution

The fourth proportional to 311.69, 429.63 and 274.61 is: 378.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.69 : 429.63 = 274.61 : x
  2. Step 2: Convert to fraction form
    311.69/429.63 = 274.61/x
  3. Step 3: Cross multiply
    311.69x = 429.63 × 274.61
  4. Step 4: Simplify right side
    311.69x = 117,980.69
  5. Step 5: Solve for x
    x = 117,980.69/311.69
  6. Step 6: Final answer
    x = 378.52

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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.